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BEGIN:VEVENT
SUMMARY:Liouville Irregular States and Argyres-Douglas theories
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1016@conference-indico.kek.jp
DESCRIPTION:Speakers: Takahiro Uetoko (Ritsumeikan University)\nWe study t
he Liouville irregular states proposed by Gaiotto and Teschner\, and evalu
ate irregular conformal blocks corresponding to the Nekrasov partition fun
ctions of the (A1\,D4) and (A1\,A3) Algyres-Douglas theories. The salient
feature of this calculation is that we discuss the Q-dependence of Nekraso
v partition function in the 2d-4d relation. Q is the Liouville charge and
corresponds to a parameter of the Omega background. Then we find that the
Q-dependence of parameters are consistent with the flavor symmetry. Moreov
er\, we discuss a generalization to rank-n irregular state. [Based on a co
llaboration with Takahiro Nishinaka]\n\nhttps://conference-indico.kek.jp/e
vent/48/contributions/1016/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1016/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Supersymmetric Born-Infeld Equations in Diverse Dimensions from Pu
re Spinor Superstring
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1015@conference-indico.kek.jp
DESCRIPTION:Speakers: Sota Hanazawa (Ibaraki University)\nBerkovits and Pe
rshin have shown that in a general background\, the ten-dimensional Born-I
nfeld equations of motion for the background fields are extracted from BRS
charge conservation in an open pure spinor superstring. We improve their
result to include even contribution of Dirichlet boundary conditions for t
he open superstring. It is expected that the resulting abelian Born-Infeld
equations contain additional higher-derivative correction in the BI field
strength and have manifest supersymmetry on D-brane world-volumes.\n\nhtt
ps://conference-indico.kek.jp/event/48/contributions/1015/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1015/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Creation of D9-brane--anti-D9-brane Pairs in Time Dependent Backgr
ound
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1014@conference-indico.kek.jp
DESCRIPTION:Speakers: Kenji Hotta (Hokkaido University)\nRecently\, we hav
e investitated Unruh effect for closed strings and for open strings on D9-
brane--anti-D9-brane pairs\, and discuss the creation of D9-brane--anti-D9
-brane pairs for highly accelerated observers. In this talk\, we consider
a simple time dependent background\, in which the spacetime becomes Minkow
ski spacetime in the far past and future\, and investigate the Hawking-Unr
uh effect of open strings on D9-brane--anti-D9-brane pairs. Then we discus
s the creation of D9-brane--anti-D9-brane pairs in the far future.\n\nhttp
s://conference-indico.kek.jp/event/48/contributions/1014/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1014/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Conformal three-point functions in momentum space
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1013@conference-indico.kek.jp
DESCRIPTION:Speakers: Toshiaki Takeuchi (Kobe University)\nWe construct th
ree-point functions with spinning operators in momentum space by explicitl
y solving the conformal Ward-Takahashi identities. In particular we demons
trate that they can be obtained by acting some differential operators on s
calar three-point functions. We expect that our results are useful\, e.g.\
, for the Polyakov type bootstrap approach and study of cosmological corre
lation functions. This work is in collaboration with Hiroshi Isono and Tos
hifumi Noumi.\n\nhttps://conference-indico.kek.jp/event/48/contributions/1
013/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1013/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergence of chiral zero modes in the IIB matrix model
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1012@conference-indico.kek.jp
DESCRIPTION:Speakers: Kohta Hatakeyama (Shizuoka University)\nWe numerical
ly investigate whether chiral zero modes appear in the IIB matrix model\,
which is known as one of non-perturbative formulations of superstring theo
ry. We examine the spectrum of the 6-dimensional Dirac operator for classi
cal solutions of the IIB matrix model\, and we find that there exist non-t
rivial zero modes and the corresponding wave functions are localized. We d
iscuss that these zero modes originate from geometry of the extra dimensio
ns.\n\nhttps://conference-indico.kek.jp/event/48/contributions/1012/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1012/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Complex poles and spectral functions of Yang-Mills theory
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1011@conference-indico.kek.jp
DESCRIPTION:Speakers: Yui Hayashi (Chiba University)\nWe derive a relation
between the number of complex poles of a propagator and some behavior of
the spectral function assuming the behavior of the propagator in the neigh
borhood of the origin and the asymptotically large region in the complex m
omentum plane. We apply this relation to the mass-deformed Yang-Mills mode
l\, which is identified with a low-energy effective theory of the Yang-Mil
ls theory\, to show within one-loop quantum corrections that the gluon pro
pagator has a pair of complex conjugate poles or tachyonic poles of multip
licity two\, while the ghost propagator has at most one tachyonic pole. Mo
reover\, we discuss the implications of these results for gluon confinemen
t.\n\nhttps://conference-indico.kek.jp/event/48/contributions/1011/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1011/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Resurgence like method and higher corrections of bounce calculatio
n
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1010@conference-indico.kek.jp
DESCRIPTION:Speakers: Naohisa Sueishi (Nagoya University)\nResurgence is a
method to connect perturbative series with nonperturbative effect via Sto
kes phenomenon. In resurgence\, Borel ambiguity should be cancelled but in
bounce calculation\, which shows the path integral itself has ambiguity\,
as a result we can the Borel ambiguity regarded as the bounce contributio
n itself.\n With this relation\, I calculated higher corrections of bounce
contribution from the perturbative series and check it with the behaviour
of the wave function.\n\nhttps://conference-indico.kek.jp/event/48/contri
butions/1010/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1010/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the emergence of (3+1)-dimensional expanding space-time in the
Lorentzian type IIB matrix model (II)
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1009@conference-indico.kek.jp
DESCRIPTION:Speakers: Mitsuaki Hirasawa (SOKENDAI)\nThe type IIB matrix mo
del has been studied as a non-perturbative formulation of superstring theo
ry. In particular\, by Monte Carlo simulation of the Lorentzian type IIB m
atrix model\, (3+1)-dimensional expanding space-time was shown to emerge d
ynamically. Moreover\, from simulations of simplified models\, it was sugg
ested that the expansion of space is exponential at early times and it tur
ns into a power-law at later times. This behavior is reminiscent of the in
flation and the FRW universe in the radiation dominant era\, respectively.
In this work we investigate the space-time structure of the matrix conf
igurations generated by the simulation and find that the 3-dimensional spa
ce is essentially described by the Pauli matrices. We attribute this probl
em to the approximation used to avoid the sign problem in Monte Carlo simu
lation and discuss the possibility that a regular 3-dimensional space emer
ges if we simulate the model without such an approximation.\n\nhttps://con
ference-indico.kek.jp/event/48/contributions/1009/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1009/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Worldsheet Instanton Corrections to Five-branes and Waves in Doubl
e Field Theory
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1008@conference-indico.kek.jp
DESCRIPTION:Speakers: Kenta Shiozawa (Kitasato University)\nWe make a comp
rehensive study on the string winding corrections to supergravity solution
s in double field theory (DFT). We find five-brane and wave solutions of d
iverse codimensions in which the winding coordinates are naturally include
d. We discuss a physical interpretation of the winding coordinate dependen
ce. The analysis based on the geometric structures behind the solutions le
ads to an interpretation of the winding dependence as string worldsheet in
stanton corrections. We also give a brief discussion on the origins of the
se winding corrections in gauged linear sigma model. Our analysis reveals
that for every supergravity solution\, one has DFT solutions that include
string winding corrections. This presentation is based on JHEP07(2018)001.
\n\nhttps://conference-indico.kek.jp/event/48/contributions/1008/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1008/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Emergent Geometries from the BMN Matrix Model
DTSTART;VALUE=DATE-TIME:20181218T073500Z
DTEND;VALUE=DATE-TIME:20181218T075000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1007@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuhma Asano (KEK)\nAn idea to formulate string theor
y or M-theory by a gauge theory attracts theorists and has been extensivel
y studied. The gauge theory should be lower dimensional so that a geometry
in string or M-theory\, which has higher dimensions\, must emerge from it
. This suggests that there would be a phase transition in the gauge theory
and that the geometry should appear as its temperature decreases. In this
talk\, I will explain the BMN matrix model\, a gauge theory considered as
a non-perturbative formulation of M-theory on the plane-wave geometry. Th
is theory has infinitely many vacua and each of them corresponds to one of
bubbling geometries in the type IIA supergravity. Gauge-theory computatio
n showed that a certain BPS operator reproduced the geometries on the grav
ity side and also brane geometries in the M-brane picture. At finite tempe
ratures\, these geometries should be realised in a non-trivial way\, an ex
ample of which is a phase transition regarding a black hole---the confinem
ent/deconfinement transition. Recently\, the gravity solution correspondin
g to the thermal BMN model around the trivial vacuum was numerically obtai
ned so that the critical temperature of the deconfinement transition was c
omputed. I will show recent results of Monte Carlo simulations of the gaug
e-theory side\, which revealed two types of phase transition\, consistent
with the gravity prediction.\n\nhttps://conference-indico.kek.jp/event/48/
contributions/1007/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1007/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Europium Oxide (EO) Phosphor: Study its behavior for Thermal Neutr
on Detector
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1006@conference-indico.kek.jp
DESCRIPTION:Speakers: Mahesh Sakharam Bhadane (DEPARTMENT OF PHYSICS\, SPP
U)\nNeutron detectors are vital devices used in various fields like nuclea
r power\, nuclear medicine\, particle physics\, etc. In the present work\,
pure europium oxide (Eu2O3) shows the remarkable results for thermal neut
ron detection. The natural thermal neutron source Cf-252 having flux 106 n
/sec/cm2 was used for irradiation of Eu2O3 samples. All the thermal neutro
n fluences were measured in ex-situ time [1-3]. For the structural confirm
ation\, the samples were characterized by using XRD and from the data it w
as observed that the intensity of the characteristics peaks decreased with
the increase in the neutron fluence. Moreover\, thermal neutron dosimetri
c characteristics of the present phosphor\, such as thermoluminescence glo
w curve\, TL dose–response\, fading\, repeatability have been studied. T
his phosphor powder represents a deeper level dosimetric trap\, which prov
ides the TL glow peak around 303 oC. The TL response of Eu2O3 phosphor as
a function of thermal neutron fluence is observed to be very linear up to
the fluence of 1.55 X 1011 n/cm2 and then saturates with further increase
in the fluence. In addition\, the TL glow curves were deconvoluted by glow
curve deconvolution (GCD) method and corresponding trapping parameters ha
ve been determined. It has been found that for every deconvoluted peak the
re is a specific level of energy trapping. The europium oxide phosphor has
been used effectively for the neutron dosimetric application.\n\nhttps://
conference-indico.kek.jp/event/48/contributions/1006/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1006/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Heterotic stringy corrections to metrics of toroidal orbifolds and
their resolutions
DTSTART;VALUE=DATE-TIME:20181217T082000Z
DTEND;VALUE=DATE-TIME:20181217T083500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1005@conference-indico.kek.jp
DESCRIPTION:Speakers: Hon Yin Leung (Waseda University)\nO(α') correction
s in 10D heterotic supergravity are known to give nontrivial contributions
compared to its type IIA/IIB counterparts. By using a conformal factor an
satz that is valid only for geometries of 2 complex (4 real) dimensions\,
we obtained a closed expression for the metric correction in the case of s
everal orbifold limits of K3\, namely T^4/Z_n where n=2\,3\,4\,6. Furtherm
ore\, we numerically investigated the behaviour around these orbifold fixe
d points by considering the metric correction on the resolution of a C^2/Z
_2 singularity. It was demonstrated that in the blow-down limit of the res
olution\, we regain the same behaviour as given by the closed form express
ion for the orbifold limits of K3\, showing that the numerical results are
valid. Further prospects of utilising these O(α') corrected metric as a
novel approach in obtaining realistic or semi-realistic Yukawa couplings a
re considered.\n\nhttps://conference-indico.kek.jp/event/48/contributions/
1005/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1005/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Systematic Search for All Three Heterotic Standard Model Vacua in
General Calabi-Yau Compactifications
DTSTART;VALUE=DATE-TIME:20181217T083500Z
DTEND;VALUE=DATE-TIME:20181217T085000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1004@conference-indico.kek.jp
DESCRIPTION:Speakers: Kenta Takemoto (Waseda U.)\nWe study a direct flux b
reaking scenario in all three heterotic string theroies on general Calabi-
Yau (CY) threefolds. We show background independent formulae to construct
three-generation models without chiral exotics from $SO(32)$\, $SO(16)\\ti
mes SO(16)$ and $E8\\times E8$ heterotic string theories. In this talk\, w
e show the algorithms to search the formulae and a concrete three-generati
on model on a specific CY threefold.\n\nhttps://conference-indico.kek.jp/e
vent/48/contributions/1004/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1004/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Dark Matter Fluid in Late Time Universe
DTSTART;VALUE=DATE-TIME:20181217T075000Z
DTEND;VALUE=DATE-TIME:20181217T080500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1003@conference-indico.kek.jp
DESCRIPTION:Speakers: Yun-Long Zhang (YITP)\nWe discuss a scenario that th
e dark matter fluid in late time universe emerges as part of the holograph
ic stress-energy tensor on the hypersurface in higher dimensional flat spa
cetime. We construct a toy model with the Friedmann-Lemaitre-Robertson-Wal
ker (FLRW) hypersurface as the holographic screen in the flat bulk. After
adding the baryonic matter on the screen\, we assume that both of the dark
matter and dark energy can be described by the Brown-York stress-energy t
ensor. From the Hamiltonian constraint equation in the flat bulk\, we find
an interesting relation between the dark matter and baryonic matter's ene
rgy density parameters\, by comparing with the Lambda cold dark matter par
ameterization. We further compare this holographic embedding of emergent d
ark matter with traditional braneworld scenario and present an alternative
interpretation as the holographic universe\, with the new parameterizatio
n of the Friedmann equation. \n[Ref: JHEP 1810 (2018) 009 [arXiv: 1712.093
26v2]]\n\nhttps://conference-indico.kek.jp/event/48/contributions/1003/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1003/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Unitarity constraint on the Kähler curvature
DTSTART;VALUE=DATE-TIME:20181217T080500Z
DTEND;VALUE=DATE-TIME:20181217T082000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1002@conference-indico.kek.jp
DESCRIPTION:Speakers: Takahiro Terada (KEK)\nIn supersymmetric theories\,
the signs of quartic terms in the Kähler\npotential control the stability
of non-supersymmetric field\nconfigurations. In particular\, in supersym
metric inflation models\,\nthe signs are important for the stability of an
inflationary\ntrajectory as well as for the prediction of the spectral in
dex. In\nthis paper\, we clarify what properties of a UV theory determine
the\nsign from unitarity arguments of scattering amplitudes. As\nnon-tri
vial examples\, we discuss the sign of a four-meson term in\nlarge N super
symmetric gauge theories and also those of the quartic\nterms obtained in
the intersecting D-brane models in superstring\ntheory. The UV origins of
inflationary models and supersymmetry\nbreaking models are constrained by
this discussion.\n\nhttps://conference-indico.kek.jp/event/48/contributio
ns/1002/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1002/
END:VEVENT
BEGIN:VEVENT
SUMMARY:A gauge-invariant regularization of chiral gauge theory
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1001@conference-indico.kek.jp
DESCRIPTION:Speakers: Katsuta Sakai (Kyoto University)\nWe propose a novel
gauge-invariant regularization for the perturbative chiral gauge theory.
We describe a chiral fermion as the massless mode of the domain-wall fermi
on. There we can regularize both the parity-odd and even part of the fermi
on loops by introducing the Pauli-Villars regulators. On the other hand\,
loops involving the gauge field are regularized by applying the dimensiona
l regularization only to the gauge field. We show that the formulation req
uires gauge-invariant counter terms only when the theory is gauge-anomaly
free\, and that the fermion number anomaly is correctly reproduced.\n\nhtt
ps://conference-indico.kek.jp/event/48/contributions/1001/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1001/
END:VEVENT
BEGIN:VEVENT
SUMMARY:The correlation functions of exactly marginal operator from AdS/CF
T
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-1000@conference-indico.kek.jp
DESCRIPTION:Speakers: Masashi Zenkai (Nagoya University)\nIn the conformal
field theory(CFT)\, there is a deformation of theory that does not change
the original CFT’s symmetry\, so called Exactly Marginal Deformation. T
he generator of this deformation is exactly marginal operator(EMO). \n The
motivation of our study is to check the properties of exactly marginal op
erator with using AdS/CFT correspondence. The properties are the correlati
on functions of EMO is allowed to be contact term only.\n From the calcula
tion in Anti-de Sitter space\, we checked this property by 4-point functio
n by perturbative way. \n We are trying to analyze higher point functions
and to find new aspects to CFT with strong coupling.\n\nhttps://conferenc
e-indico.kek.jp/event/48/contributions/1000/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/1000/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holography from field theories and a realization of AdS/CFT corres
pondence
DTSTART;VALUE=DATE-TIME:20181220T023000Z
DTEND;VALUE=DATE-TIME:20181220T031000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-999@conference-indico.kek.jp
DESCRIPTION:Speakers: Sinya Aoki ()\nI argue that the Anti-de-Sitter (AdS)
geometry in $d+1$ dimensions naturally emerges from an arbitrary conforma
l field theory in $d$ dimensions using the free flow equation. I first sho
w that an induced metric defined from the flowed field generally correspon
ds to the quantum information metric\, called the Bures or Helstrom metric
\, if the flowed field is normalized appropriately. I next verify that the
induced metric computed explicitly with the free flow equation always bec
omes the AdS metric when the theory is conformal. I also show that the con
formal symmetry in $d$ dimensions converts to the AdS isometry in $d+1$ di
mensions after $d$ dimensional quantum averaging. This guarantees the emer
gence of AdS geometry without explicit calculation. I finally discuss seve
ral extensions of this method including the latest results.\n\nhttps://con
ference-indico.kek.jp/event/48/contributions/999/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/999/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Momentum space approach to crossing symmetric CFT correlators
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-998@conference-indico.kek.jp
DESCRIPTION:Speakers: Hiroshi Isono (Chulalongkorn University)\nWe constru
ct a crossing symmetric basis for conformal four-point functions in moment
um space by requiring consistent factorization. Just as scattering amplitu
des factorize when the intermediate particle is on-shell\, non-analytic pa
rts of conformal correlators enjoy a similar factorization in momentum spa
ce. Based on this property\, Polyakov\, in his pioneering 1974 work\, intr
oduced a basis for conformal correlators which manifestly satisfies the cr
ossing symmetry. He then initiated the bootstrap program by requiring its
consistency with the operator product expansion. This approach is compleme
ntary to the ordinary bootstrap program\, which is based on the conformal
block and requires the crossing symmetry as a consistency condition of the
theory. Even though Polyakov's original bootstrap approach has been revis
ited recently\, the crossing symmetric basis has not been constructed expl
icitly in momentum space. In this poster talk we show the complete the con
struction of the crossing symmetric basis for scalar four-point functions
with an intermediate operator with a general spin\, by using new analytic
expressions for three-point functions involving one tensor. Our new basis
manifests the analytic properties of conformal correlators. Also the conne
cted and disconnected correlators are manifestly separated\, so that it wi
ll be useful for the study of large N CFTs in particular.\n\nhttps://confe
rence-indico.kek.jp/event/48/contributions/998/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/998/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement string\, Mott transition and holographic Spin Liquid
DTSTART;VALUE=DATE-TIME:20181219T014000Z
DTEND;VALUE=DATE-TIME:20181219T022000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-997@conference-indico.kek.jp
DESCRIPTION:Speakers: Sang-Jin Sin ()\nWe prove that there is an open stri
ng in the spectrum of holographic Fermion coupled with a scalar. The st
ring ends at two fermions and its tension vanishes in the limit of zero s
calar condensation. We call it “entanglement string”. The model shows
a Mott transition so that together with divergently large entanglement ent
ropy\, our model is qualified to describe the Resonating Valence Bond in h
olographic setup.\n\nhttps://conference-indico.kek.jp/event/48/contributio
ns/997/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/997/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Perturbative moduli stabilisation in type IIB/F-theory framework
DTSTART;VALUE=DATE-TIME:20181217T072000Z
DTEND;VALUE=DATE-TIME:20181217T073500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-996@conference-indico.kek.jp
DESCRIPTION:Speakers: Yifan Chen (LPTHE\, Sorbonne Universite)\nWe propose
a new mechanism of (geometric) moduli stabilisation in type IIB/F-theory
four-dimensional compactifications on Calabi–Yau manifolds\, in the pres
ence of 7-branes\, that does not rely on non-perturbative effects. Complex
structure moduli and the axion-dilaton system are stabilised in the stand
ard way\, without breaking supersymmetry\, using 3-form internal fluxes. K
ähler class moduli stabilisation utilises perturbative string loop correc
tions\, together with internal magnetic fields along the D7-branes world-v
olume leading to Fayet-Iliopoulos D-terms in the effective supergravity ac
tion. The main ingredient that makes the stabilisation possible at a de Si
tter vacuum is the logarithmic dependence of the string loop corrections i
n the large two-dimensional transverse volume limit of the 7-branes. arXi
v:1803.08941\n\nhttps://conference-indico.kek.jp/event/48/contributions/99
6/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/996/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On stability of compactified Lovelock gravity with symmetric Riema
nn manifolds
DTSTART;VALUE=DATE-TIME:20181217T073500Z
DTEND;VALUE=DATE-TIME:20181217T075000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-995@conference-indico.kek.jp
DESCRIPTION:Speakers: Keisuke Ohashi (Keio University)\nLet us consider Lo
velock theory of gravity in higher dimensional spacetime and compactify ex
tra dimensions with a variety of symmetric Riemann manifolds.\nIn those ca
ses\, stability of size moduli of such internal spaces need non-vanishing
higher-order Lovelock terms higher than the quadratic term. That is\, a di
mension of the internal space must be larger than or equal to six.\n\nhttp
s://conference-indico.kek.jp/event/48/contributions/995/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/995/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the emergence of (3+1)-dimensional expanding space-time in the
Lorentzian type IIB matrix model (I)
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-994@conference-indico.kek.jp
DESCRIPTION:Speakers: Toshihiro Aoki (SOKENDAI)\nThe type IIB matrix model
was proposed as a non-perturbative formulation of superstring theory in 1
997. The emergence of (3+1)-dimensional space-time was observed in Monte C
arlo studies of its Lorentzian version. This implies that an expanding (3+
1)-dimensional space-time naturally appears from (9+1)-dimensional space-t
ime\, in which superstring theory is defined. The expanding behavior was s
tudied by simulating simplified versions of the model\, which suggested th
at the expansion is exponential at the beginning\, and it turns into a pow
er law at later times. This property is reminiscent of the inflation and t
he FRW universe\, respectively. In this work we investigate the space-time
structure of the matrix configurations obtained in the simulation\, and f
ind that the expanding 3d space is described essentially by the Pauli \nma
trices. We attribute this problem to an approximation\, which is used\nto
avoid the sign problem in Monte Carlo simulation\, and discuss the\npossib
ility of obtaining a regular space-time if we investigate the\noriginal mo
del without such an approximation.\n\nhttps://conference-indico.kek.jp/eve
nt/48/contributions/994/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/994/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Wavefunction localization on S^2 with flux and branes
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-993@conference-indico.kek.jp
DESCRIPTION:Speakers: Sosuke Imai (Waseda University)\nLocalized Kaluza-Kl
ein zero-mode wavefunctions are desired for extra dimensional models to ex
plain the Yukawa hierarchy of the Standard Model of particle physics. This
is why the magnetized S^2\, which wavefunctions on are not localized\, ar
e phenomenologically unfavorable as extra dimensions.\nIn this work\, we r
evisit S^2 with introducing 3-branes in addition to magnetic flux. We deri
ve wavefunctions analytically and show that they are enough localized for
the Yukawa hierarchy due to branes.\n\nhttps://conference-indico.kek.jp/ev
ent/48/contributions/993/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/993/
END:VEVENT
BEGIN:VEVENT
SUMMARY:SO(10) chiral gauge theory and the Standard Model on the lattice w
ith exact gauge invariance
DTSTART;VALUE=DATE-TIME:20181218T043000Z
DTEND;VALUE=DATE-TIME:20181218T051000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-992@conference-indico.kek.jp
DESCRIPTION:Speakers: Yoshio Kikukawa (University of Tokyo\, Institute of
Physics (Komaba))\nhttps://conference-indico.kek.jp/event/48/contributions
/992/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/992/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Holographic Entanglement of Purification and CFT Dual
DTSTART;VALUE=DATE-TIME:20181219T003000Z
DTEND;VALUE=DATE-TIME:20181219T011000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-991@conference-indico.kek.jp
DESCRIPTION:Speakers: Tadashi Takayanagi ()\nFirst we explain our recent c
onjecture that a gravity dual of a quantity called entanglement of purific
ation is given by the minimal area of entanglement wedge cross section in
AdS. This provides a simple generalization of holographic entanglement ent
ropy to mixed states. Then we argue that in AdS3/CFT2 setups\, the hologra
phic entanglement of purification agrees with the entanglement entropy in
a conformal field theory for a purified state obtained from a special Weyl
transformation\, called path-integral optimizations. In other words\, thi
s special purified state has the minimal path-integral complexity.\n\nhttp
s://conference-indico.kek.jp/event/48/contributions/991/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/991/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Generalized supergravity and Weyl invariance
DTSTART;VALUE=DATE-TIME:20181220T013000Z
DTEND;VALUE=DATE-TIME:20181220T021000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-990@conference-indico.kek.jp
DESCRIPTION:Speakers: Kentaroh Yoshida ()\nRecently\, there has been a fun
damental and significant development in the Green-Schwarz (GS) formulation
of superstring theory. In this formulation\, the kappa-symmetry plays a c
entral role to ensure the consistency of the theory. In 2016\, Tseytlin an
d Wulff showed that the kappa-symmetry constraints of the GS superstring d
efined on an arbitrary background lead to a ``generalized'' supergravity\,
which contains an additional (non-dynamical) vector field\, rather than t
he standard supergravity. This result indicates that we might have overloo
ked a potentially important ingredient in the low-energy effective theory
of string theory for long time\, and may open up new directions including
phenomenology and cosmology.\n\nIn this talk\, I will introduce what is th
e generalized supergravity and then discuss Weyl invariance of string theo
ries on generalized supergravity backgrounds.\n\nhttps://conference-indico
.kek.jp/event/48/contributions/990/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/990/
END:VEVENT
BEGIN:VEVENT
SUMMARY:2 dim QED and string theory revisited
DTSTART;VALUE=DATE-TIME:20181220T003000Z
DTEND;VALUE=DATE-TIME:20181220T011000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-989@conference-indico.kek.jp
DESCRIPTION:Speakers: Shigeki Sugimoto ()\nhttps://conference-indico.kek.j
p/event/48/contributions/989/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/989/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An overview of string field theory
DTSTART;VALUE=DATE-TIME:20181218T054000Z
DTEND;VALUE=DATE-TIME:20181218T062000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-988@conference-indico.kek.jp
DESCRIPTION:Speakers: Nobuyuki Ishibashi ()\nI would like to given an over
view of the recent development of string field theory.\n\nhttps://conferen
ce-indico.kek.jp/event/48/contributions/988/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/988/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Multiverse Partition Function and Maximum Entropy Principle
DTSTART;VALUE=DATE-TIME:20181218T003000Z
DTEND;VALUE=DATE-TIME:20181218T011000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-987@conference-indico.kek.jp
DESCRIPTION:Speakers: Hikaru Kawai ()\nhttps://conference-indico.kek.jp/ev
ent/48/contributions/987/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/987/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Gauge symmetry breaking in models with D-branes
DTSTART;VALUE=DATE-TIME:20181218T014000Z
DTEND;VALUE=DATE-TIME:20181218T022000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-986@conference-indico.kek.jp
DESCRIPTION:Speakers: Noriaki Kitazawa ()\nThe gauge symmetry breaking in
string models with D-branes is discussed. Starting from a simple argument
that the parallel separation of D-branes exhibits spontaneous gauge symmet
ry breaking\, the mechanism of rank reduction of gauge group\, which is ne
cessary for realistic electroweak symmetry breaking\, is discussed. The me
chanism for a fixed stable scale of gauge symmetry breaking\, which is nec
essary for real physics\, is also discussed. It is nothing but the problem
of the stabilization of D-brane moduli fields.\n\nhttps://conference-indi
co.kek.jp/event/48/contributions/986/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/986/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Flavor modular symmetry
DTSTART;VALUE=DATE-TIME:20181217T050000Z
DTEND;VALUE=DATE-TIME:20181217T054000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-985@conference-indico.kek.jp
DESCRIPTION:Speakers: Tatsuo Kobayashi ()\nhttps://conference-indico.kek.j
p/event/48/contributions/985/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/985/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Cosmological Constant Problem and Scale Invariance
DTSTART;VALUE=DATE-TIME:20181217T061000Z
DTEND;VALUE=DATE-TIME:20181217T065000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-984@conference-indico.kek.jp
DESCRIPTION:Speakers: Taichiro Kugo ()\nI first explain that the classical
scale invariance is a necessary condition for the calculability of the va
cuum energy. Then\, I discuss how sufficient the scale invariance is for s
olving the cosmological constant problem as well as the gauge hierarchy pr
oblem.\n\nhttps://conference-indico.kek.jp/event/48/contributions/984/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/984/
END:VEVENT
BEGIN:VEVENT
SUMMARY:What's new with $G_2$
DTSTART;VALUE=DATE-TIME:20181217T011000Z
DTEND;VALUE=DATE-TIME:20181217T015000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-983@conference-indico.kek.jp
DESCRIPTION:Speakers: Sakura Schafer-Nameki ()\nhttps://conference-indico.
kek.jp/event/48/contributions/983/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/983/
END:VEVENT
BEGIN:VEVENT
SUMMARY:On the vacuum structure of F-theory compactifications
DTSTART;VALUE=DATE-TIME:20181217T021000Z
DTEND;VALUE=DATE-TIME:20181217T025000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-982@conference-indico.kek.jp
DESCRIPTION:Speakers: Hajime Otsuka ()\nWe discuss moduli stabilization of
the F-theory compactified\non elliptically fibered Calabi-Yau fourfolds.\
nWe turn on appropriate G-fluxes to stabilize all the complex structure mo
duli fields\,\ncorresponding to the open and closed string moduli in the t
ype IIB limit.\nIt is found that they can be stabilized at the Minkowski o
r de Sitter minimum.\nWe also discuss the swampland conjecture in the glob
al F-theory context.\n\nhttps://conference-indico.kek.jp/event/48/contribu
tions/982/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/982/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Geometry of the 2-loop MHV amplituhedron
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-981@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryota Kojima (KEK)\nNima arkani-Hamed and Jaroslav t
rnka found a new mathematical object\, "the Amplituhedron" that its 'volum
e' is the amplitude in planar N=4 SYM.\nWe found a new explicit formula fo
r the n-pt 2-loop MHV amplitude from the amplituhedron and obtain some pro
perties of the amplitude from this result. In this talk\, I will briefly e
xplain the definition of the amplituhedron and our results about a geometr
y of the 2-loop amplituhedron.\n\nhttps://conference-indico.kek.jp/event/4
8/contributions/981/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/981/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Localization of gauge fileds on brane via higgs mechanism
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-980@conference-indico.kek.jp
DESCRIPTION:Speakers: Masaki Kawaguchi (Yamagata University)\nWe study a l
ocalization mechanism of gauge fields on a 3-brane in Yang-Mills-Higgs mod
els with a modified kinetic term of gauge fields in non-compact extra dime
nsions (D>4). The localization mechanism is carried out when the Higgs fie
ld locally condenses on the 3-brane. Hence\, the Higgs mechanism yields\,
in addition to two conventional roles (spontaneous symmetry breaking of th
e gauge symmetry and generating mass for chiral fermions)\, a new import
ant consequence\, namely\, localization of the gauge fields on a 3-brane.
The lightest localized gauge field is massless (massive) if the Higgs fiel
d is neutral (charged) to the gauge field.\n\nhttps://conference-indico.ke
k.jp/event/48/contributions/980/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/980/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Universal Structure of Covariant Holographic Two-Point Functions I
n Massless Higher-Order Gravities
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-979@conference-indico.kek.jp
DESCRIPTION:Speakers: Zhan-Feng Mai (Tianjin University)\nWe derive\nthe c
ovariant holographic two-point functions and find that they have a univers
al structure.\nIn particular\, the theory-dependent overall coefficient C_
{T} can be universally expressed by\n(d − 1)C_{T} = ℓ(∂a/∂ℓ)\, w
here a is the holographic a-charge. We verify this relation in quasitopolo
gical\nRicci polynomial\, Einstein-Gauss-Bonnet\, Einstein-Lovelock and Ei
nstein cubic\ngravities.\n\nhttps://conference-indico.kek.jp/event/48/cont
ributions/979/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/979/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Fracton topological order and holography
DTSTART;VALUE=DATE-TIME:20181219T024500Z
DTEND;VALUE=DATE-TIME:20181219T030000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-978@conference-indico.kek.jp
DESCRIPTION:Speakers: Han Yan (Okinawa Institute of Science and Technology
)\nWe propose that the fracton topological order is a class of toy models
for holography. The discovery of AdS/CFT correspondence as a concrete cons
truction of holography\, and the subsequent developments including the Ryu
-Takanayagi formula of entanglement entropy have revolutionized our unders
tanding of quantum gravity\, and provided a powerful tool set for solving
various strongly-coupled quantum field theory problems. To resolve many of
the mysteries of holography\, toy models can be very helpful. One example
is the holographic tensor-network constructions which illuminate the quan
tum error-correcting properties of gravity in AdS space. In this work we d
iscuss a classical toy model based on fracton topological order\, a class
of exotic many-body systems with boundary area law of ground state degener
acy and (partially) immobile excitations. We show that such a model define
d on the hyperbolic lattice satisfies some key properties of holographic c
orrespondence. These properties include: the AdS-Rindler reconstruction is
realized\; the mutual information obeys the Ryu-Takayanagi formula\, and
a naively defined black hole's entropy scales as its horizon area. We end
with an outlook of how fracton model may be used to concretely demonstrate
the quantum-error correction encoding procedure of toy models for gravity
.\n\nhttps://conference-indico.kek.jp/event/48/contributions/978/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/978/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Numerical study of the $\\mathcal{N}=2$ Landau--Ginzburg model
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-977@conference-indico.kek.jp
DESCRIPTION:Speakers: Okuto Morikawa (Kyushu University)\nIt is believed t
hat the two-dimensional massless $\\mathcal{N}=2$ Wess--Zumino model becom
es the $\\mathcal{N}=2$ SCFT in the IR limit. We examine this theoretical
conjecture of the Landau--Ginzburg (LG) description of the $\\mathcal{N}=2
$ SCFT by numerical simulations on the basis of a supersymmetric-invariant
momentum-cutoff regularization. We study one or two supermultiplets with
various superpotentials. From a two-point correlation function in the IR r
egion\, we measure the central charge\, which is consistent with the conje
ctured LG description of the ADE minimal models. Our result supports the t
heoretical conjecture and\, at the same time\, indicates a possible comput
ational method of correlation functions in the $\\mathcal{N}=2$ SCFT from
the LG description.\n\nhttps://conference-indico.kek.jp/event/48/contribut
ions/977/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/977/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Diffeomorphism for fuzzy spaces
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-976@conference-indico.kek.jp
DESCRIPTION:Speakers: Takashi Matsumoto (University of Tsukuba)\nFuzzy spa
ces are known as a typical example of noncommutative geometry and expected
to describe the fundamental structure of space-time. However\, the mechan
ism to describe gravity in the framework of fuzzy spaces remains to be com
pletely elucidated. In order to understand the mechanism\, we focus on the
notion of diffeomorphisms\, which plays a key role in the classical theor
y of gravity. In this talk\, we propose a formulation of the diffeomorphis
ms for fuzzy spaces in terms of the Berezin-Toeplitz quantization map\, wh
ich is introduced in the context of geometric quantization. We apply this
formulation to 2-sphere as an example and obtain new matrix configurations
that are diffeomorphic to the standard fuzzy sphere given by the generato
rs of SU(2) Lie algebra.\n\nhttps://conference-indico.kek.jp/event/48/cont
ributions/976/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/976/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Chaos of interquark force via holography
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-975@conference-indico.kek.jp
DESCRIPTION:Speakers: Toshihiro Ota (Osaka university)\nAdS/CFT correspond
ence tells us that the energy of an open string hanging on the boundary of
a curved spacetime is equivalent to the Wilson loop in the gauge theory s
ide. In general\, the motion of a string in a curved background shows chao
tic behavior. Then\, how is the chaos seen in observables in a QFT? We stu
dy the dynamics of an open string in the D4-soliton geometry which corresp
onds to a pure Yang-Mills theory and find it is chaotic. This means that t
he interquark force in 4d large Nc QCD is chaotic\, and we evaluate the Ly
apunov exponent.\n\nhttps://conference-indico.kek.jp/event/48/contribution
s/975/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/975/
END:VEVENT
BEGIN:VEVENT
SUMMARY:An analysis for excited baryons based on gauge/gravity corresponde
nce
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-974@conference-indico.kek.jp
DESCRIPTION:Speakers: Takahiro Ogino (Nagoya University)\nWe attempt to de
scribe baryons based on gauge/gravity correspondence. In particular\, we f
ocus on baryon excited states and employ D4/D8-brane model\, which is not
still investigated in detail from this point of view. First\, we take the
limit where the effect of the curved background is negligible and then stu
dy the spectrum of strings in the flat spacetime. After that we attempt to
incorporate perturbatively the effect of the curved background\, RR flux
and interactions between open strings appearing in our system which should
be seen as baryons.\n\nhttps://conference-indico.kek.jp/event/48/contribu
tions/974/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/974/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Topological string geometry theory
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-973@conference-indico.kek.jp
DESCRIPTION:Speakers: Matsuo Sato (Hirosaki University)\nPerturbative stri
ng amplitudes are correctly derived from the string geometry theory\, whic
h is one of the candidates of a non-perturbative formulation of string the
ory. In order to derive non-perturbative effects rather easily from the th
eory\, we formulate topological string geometry theory\, which is obtained
by restricting the string geometry theory to its topological sector. Beca
use string geometry is described by a superfield formalism\, we first desc
ribe the topological string theory in a superfield formalism. By construct
ing a string geometry based on this superfield formalism\, we formulate th
e topological string geometry theory. We derive the perturbative partition
function of the topological string theory from fluctuations around a clas
sical solution in the topological string geometry theory. We will discuss
how to derive non-perturbative corrections on the partition function by us
ing the localization techniques.\n\nhttps://conference-indico.kek.jp/event
/48/contributions/973/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/973/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Matrix model and Yukawa couplings on the magnetized noncommutative
torus
DTSTART;VALUE=DATE-TIME:20181218T072000Z
DTEND;VALUE=DATE-TIME:20181218T073500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-972@conference-indico.kek.jp
DESCRIPTION:Speakers: Masaki Honda (Waseda U.)\nIKKT model was proposed as
a non-perturbative formulation of superstring theory. We propose a Dirac
operator on the noncommutative torus\, which is consistent with IKKT model
\, based on noncommutative geometry. In addition\, we consider zero-mode e
quations of our Dirac operator with magnetic fluxes. We find that zero-mod
e solutions have chirality and generation structures similar to the commut
ative case. Moreover\, we compute normalization factors of the zero-mode s
olutions and Yukawa couplings of chiral matter fields based on the star-pr
oduct formalism.\n\nhttps://conference-indico.kek.jp/event/48/contribution
s/972/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/972/
END:VEVENT
BEGIN:VEVENT
SUMMARY:CFTs on curved space
DTSTART;VALUE=DATE-TIME:20181218T070500Z
DTEND;VALUE=DATE-TIME:20181218T072000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-971@conference-indico.kek.jp
DESCRIPTION:Speakers: Ken Kikuchi (Fudan)\nWe revisit CFTs by studying tho
se on curved metric spaces\, both orientable and unorientable possibly wit
h boundaries.\n\nhttps://conference-indico.kek.jp/event/48/contributions/9
71/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/971/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Yang-Baxter deformations and local O(d\,d) transformation
DTSTART;VALUE=DATE-TIME:20181218T065000Z
DTEND;VALUE=DATE-TIME:20181218T070500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-970@conference-indico.kek.jp
DESCRIPTION:Speakers: Yuho Sakatani (Kyoto prefectural university of medic
ine)\nRecently\, techniques of Yang-Baxter deformation have been developed
to study deformations of string sigma model. The deformation can be regar
ded as the deformation of the target space\, and the deformed background a
lways satisfies the (generalized) supergravity equations of motion. We sho
w that the (homogeneous) YB deformations are a kind of local O(d\,d) trans
formation and discuss its generalization. This talk is based on a collabor
ation with Jun-ichi Sakamoto [arXiv:1803.05903].\n\nhttps://conference-ind
ico.kek.jp/event/48/contributions/970/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/970/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Signature of quantum chaos in operator entanglement in 2d CFTs
DTSTART;VALUE=DATE-TIME:20181219T023000Z
DTEND;VALUE=DATE-TIME:20181219T024500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-969@conference-indico.kek.jp
DESCRIPTION:Speakers: Masahiro Nozaki (RIKEN)\nWe study operator entanglem
ent measures of the unitary evolution operators of (1+1)-dimensional confo
rmal field theories\, aiming to uncover scrambling and chaotic behaviors t
hereof. In particular\, we compute the bi-partite and tri-partite mutual i
n- formation for various configurations of input and output subsystems\, a
nd as a function of time. We contrast three different conformal field theo
ries: the free fermion the- ory\, compactified free boson theory at variou
s radii\, and conformal field theories with holographic dual. We found tha
t the bi-partite mutual information exhibits distinct behaviors for these
different conformal field theories\, reflecting the different informa- tio
n scrambling abilities of these unitary operators\; while a quasi-particle
picture can describe well the case of the free fermion and free boson con
formal field theories\, it completely fails for the case of holographic co
nformal field theories. Similarly\, the tripartite mutual information also
distinguishes the unitary evolution operators of dif- ferent conformal fi
eld theories. In particular\, the late time behaviors of the tripartite mu
tual information\, when the output subsystems are semi-infinite\, are quit
e distinct for the free fermion conformal field theory\, the free boson th
eory at different compacti- fication radii\, and holographic conformal fie
ld theories. We speculate that the late time saturation value of the tripa
rtite information for holographic conformal field theories saturates the l
ower bound of the negativity of the tripartite mutual information.\n\nhttp
s://conference-indico.kek.jp/event/48/contributions/969/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/969/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Entanglement Entropy and Decoupling in the Universe
DTSTART;VALUE=DATE-TIME:20181218T082000Z
DTEND;VALUE=DATE-TIME:20181218T083500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-968@conference-indico.kek.jp
DESCRIPTION:Speakers: Noburo Shiba (KEK)\nIn the expanding universe\, two
interacting fields are no longer in thermal contact when the interaction r
ate becomes smaller than the Hubble expansion rate. After decoupling\, two
subsystems are usually treated separately in accordance with equilibrium
thermodynamics and the thermodynamic entropy gives a fiducial quantity con
served in each subsystem. In this paper\, we discuss a correction to this
paradigm from quantum entanglement of two coupled fields. The thermodynami
c entropy is generalized to the entanglement entropy. We formulate a pertu
rbation theory to derive the entanglement entropy and present Feynman rule
s in diagrammatic calculations. For specific models to illustrate our form
ulation\, an interacting scalar-scalar system\, quantum electrodynamics\,
and the Yukawa theory are considered. We calculate the entanglement entrop
y in these models and find a quantum correction to the thermodynamic entro
py. The correction is revealed to be important in circumstances of instant
aneous decoupling.\n\nhttps://conference-indico.kek.jp/event/48/contributi
ons/968/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/968/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Higher derivative three-form gauge theories and their supersymmetr
ic extension
DTSTART;VALUE=DATE-TIME:20181218T080500Z
DTEND;VALUE=DATE-TIME:20181218T082000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-967@conference-indico.kek.jp
DESCRIPTION:Speakers: Ryo Yokokura (Keio U.)\nWe investigate three-form ga
uge theories with higher derivative interactions and their supersymmetric
extensions in four space-time dimensions. For the bosonic three-form gauge
theories\, we show that derivatives on the field strength of the 3-form g
auge field yield a tachyon as far as the Lagrangian contains a quadratic k
inetic term\, while such the term with opposite sign gives rise to a ghost
. We confirm that there is neither a tachyon nor a ghost when all higher d
erivative terms are given by functions of the field strength. For this gho
st/tachyon-free Lagrangian\, we determine the boundary term necessary for
the consistency between the equation of motion and energy-momentum tensor.
For supersymmetric extensions\, we present ghost/tachyon-free higher deri
vative interactions of arbitrary order of the field strength and correspon
ding boundary terms as well.\n\nhttps://conference-indico.kek.jp/event/48/
contributions/967/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/967/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Towards a C-theorem in defect CFT
DTSTART;VALUE=DATE-TIME:20181218T075000Z
DTEND;VALUE=DATE-TIME:20181218T080500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-966@conference-indico.kek.jp
DESCRIPTION:Speakers: Kento Watanabe (University of Tokyo)\nWe explore a C
-theorem in defect conformal field theories (DCFT) that unify all the know
n conjectures and theorems until now. We examine as a candidate C-function
the additional contributions from conformal defects to the sphere free en
ergy and the entanglement entropy across a sphere in a number of examples
including holographic models. We find the two quantities are equivalent\,
when suitably regularized\, for codimension-one defects (or boundaries)\,
but differ by a universal constant term otherwise. Moreover\, we find in a
few field theoretic examples that the sphere free energy decreases but th
e entanglement entropy increases along a certain renormalization group (RG
) flow triggered by a defect localized perturbation which is assumed to ha
ve a trivial IR fixed point without defects. We hence propose a C-theorem
in DCFTs stating that the increment of the regularized sphere free energy
due to the defect does not increase under any defect RG flow. We also prov
ide a proof of our proposal in several holographic models of defect RG flo
ws. (Ref: 1810.06995[hep-th])\n\nhttps://conference-indico.kek.jp/event/48
/contributions/966/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/966/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Black hole entropy\, T-duality and high-derivative gravity theorie
s
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-965@conference-indico.kek.jp
DESCRIPTION:Speakers: J. Anibal Sierra-Garcia (Chulalongkorn University)\n
I consider a two-parameter family of higher-derivative gravitational actio
ns exhibiting T-duality. Some values of the parameters correspond to strin
g theory effective actions\, but most of them do not. For all cases\, I wi
ll show black hole entropy and temperature to be invariant under T-duality
. As an explicit example\, BTZ black hole and its T-dual black string are
presented.\n\nhttps://conference-indico.kek.jp/event/48/contributions/965/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/965/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inflationary cosmology via quantum corrections in M-theory
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-964@conference-indico.kek.jp
DESCRIPTION:Speakers: Kazuho Hiraga (Ibaraki University)\nInflation is a p
romising scenario of the early Universe and it can explain cosmological ob
servations of CMB. Although there are a lot of models for the inflation\,
recently it is possible to restrict them by comparing cosmological paramet
ers with the observations. We investigate inflationary cosmology by solvin
g the effective action of the M-theory\, which consists of the 11 dimensio
nal supergravity with quartic terms of the Weyl tensor. We also discuss pe
rturbation around the background metric to compare the cosmological parame
ter.\n\nhttps://conference-indico.kek.jp/event/48/contributions/964/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/964/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Inflation\, dark energy and dark matter in liberated supergravity
with new FI terms
DTSTART;VALUE=DATE-TIME:20181219T030000Z
DTEND;VALUE=DATE-TIME:20181219T031500Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-963@conference-indico.kek.jp
DESCRIPTION:Speakers: Sergey Ketov (Tokyo Metropolitan University)\nNew in
flationary models in supergravity with the Dirac-Born-Infeld type kinetic
terms and new Fayet-Iliopoulos-type terms are constructed. These models c
an be considered as the string-inspired deformations of Starobinsky inflat
ionary model in supergravity. Their phenomenological applications are brie
fly discussed.\n\nhttps://conference-indico.kek.jp/event/48/contributions/
963/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/963/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Symmetry Breaking in Quantum Curves and Super Chern-Simons Matrix
Models
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-962@conference-indico.kek.jp
DESCRIPTION:Speakers: Naotaka Kubo (Yukawa Institute for Theoretical Physi
cs)\nIt was known that quantum curves and super Chern-Simons matrix models
correspond to each other. From the viewpoint of symmetry\, the algebraic
curve of genus one\, called the del Pezzo geometry\, enjoys symmetries of
the exceptional algebra\, while the super Chern-Simons matrix model is des
cribed by the free energy of topological strings on the del Pezzo backgrou
nd with the symmetry broken. We study the symmetry breaking of the quantum
cousin of the algebraic curve and find that the symmetry breaking reprodu
ces the results in the super Chern-Simons matrix models.\n\nhttps://confer
ence-indico.kek.jp/event/48/contributions/962/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/962/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Hermitian matrix model with cusp potential
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-961@conference-indico.kek.jp
DESCRIPTION:Speakers: Kento Sugiyama (Shizuoka University)\nIn this poster
\, we investigate zero and one dimensional Hermitian matrix models with cu
sp potentials at large N. We show that large N phase transitions in these
models are quite different from the third order phase transitions in the o
rdinary polynomial potential cases. Particularly the zero dimensional matr
ix models exhibit unexpected behaviors.\n\nhttps://conference-indico.kek.j
p/event/48/contributions/961/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/961/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Extended quantum mechanical supersymmetry with central charges in
higher dimensional Dirac field
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-960@conference-indico.kek.jp
DESCRIPTION:Speakers: Inori Ueba (Kobe University)\nWe have found that the
N-extended quantum mechanical supersymmetry with central charges is hidde
n in the 4D mass spectrum of higher dimensional Dirac field. The superchar
ges tell us a relationship among the Kaluza-klain (KK) mode functions with
degenerate 4D mass eigenvalues due to the degrees of freedom of the highe
r dimensional spinor. Furthermore\, we focus on the BPS states which form
the short multiplets.\n\nhttps://conference-indico.kek.jp/event/48/contrib
utions/960/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/960/
END:VEVENT
BEGIN:VEVENT
SUMMARY:Appearance of chiral exact zero modes from classical solutions of
type IIB matrix model
DTSTART;VALUE=DATE-TIME:20181219T060000Z
DTEND;VALUE=DATE-TIME:20181219T090000Z
DTSTAMP;VALUE=DATE-TIME:20200530T144509Z
UID:indico-contribution-48-959@conference-indico.kek.jp
DESCRIPTION:Speakers: Atis Yosprakob (KEK/SOKENDAI)\nWe discuss some class
ical solutions of type IIB matrix model that generate chiral fermions\, wh
ich is essential for realizing the Standard Model. In particular\, we cons
ider solutions constructed from representations of special unitary groups'
generators. Fermion wave functions can then be generated as eigenvectors
of the associated matrix Dirac operator. It is found that many solutions g
ive large number of exact zero modes. However\, only zero modes that are l
ocalized can be interpreted as fermions at brane intersections. We can opt
imize the localization by mixing these zero modes together. Finally\, we r
eport some solutions and number of the associated localized chiral zero mo
des.\n\nhttps://conference-indico.kek.jp/event/48/contributions/959/
LOCATION:Kenkyu-Honkan bldg. 1F Kobayashi Hall
URL:https://conference-indico.kek.jp/event/48/contributions/959/
END:VEVENT
END:VCALENDAR