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Evolution of the inhomogeneous universe: From Inflation to structure formation

6–8 Nov 2024
KEK Tsukuba campus.
Asia/Tokyo timezone

Contribution List

27 / 27
2. EFT for inflation and LSS
Mehrdad Mirbabayi
06/11/2024, 09:30

TBA
3. EFT-based forward models, partition function, and RG flow
Fabian Schmidt
06/11/2024, 10:30

TBA
4. Entropy in a Coherent Universe: Quantum Information in the Action of the Cosmic SuperWeb
J. Richard Bond
06/11/2024, 13:15

von Neumann of (thermal) quantum entropy fame purportedly responded to Shannon asking what his novel classical information content measure should be called: paraphrasing, entropy, nobody understands it anyway. Nowadays information entropy and thermal entropy have merged as ideas, and expanded to encompass phase info as well as counting info, aka quantum information. Its development and...
5. From Quantum Fields to Stochastic Random Variables: Why Starobinsky's Formalism Works
Richard Woodard
06/11/2024, 14:30
6. Separate universe, delta N and beyond.
Atsushi Naruko
06/11/2024, 15:30

TBA
7. Dyanamics of Primordial Black Hole Formation
Chulmoon Yoo
06/11/2024, 17:00

TBA
8. Non-Gaussianity in Primordial Black Hole Formation
Shi Pi
07/11/2024, 09:20

I will briefly review the recent progress in the non-Gaussian effect on the formation of primordial black holes (PBHs) and the generation of induced gravitational waves (GWs).The most promising mechanism of generating PBHs is by the enhancement of power spectrum of the primordial curvature perturbation, which is usually accompanied by the the enhancement of non-Gaussianity that crucially...
9. Radiation exchange in primordial gravitational waves
Atsuhisa Ota
07/11/2024, 10:00

TBA
10. Primordial Black Holes from double-field inflationary models
Ying-li Zhang
07/11/2024, 11:00

Primordial black holes (PBHs) are a kind of black holes which may form during the primordial epoch of the universe. In this talk, I will discuss two different mechanisms of formation of PBHs (namely PBHs from enhancement of primordial curvature perturbations, and PBHs from the collapse of bubbles) in double-field inflationary models.
11. STOLAS: STOchastic LAttice Simulation of cosmic inflation
Yu-ichiro Tada
07/11/2024, 14:00

We develop a C++ package of the STOchastic LAttice Simulation (STOLAS) of cosmic inflation. It performs the numerical lattice simulation in the application of the stochastic-deltaN formalism. STOLAS can directly compute the three-dimensional map of the observable curvature perturbation without estimating its statistical properties. In its application to two toy models of inflation, chaotic...
12. Analytical methods in stochastic inflation
Koki Tokeshi
07/11/2024, 14:40

The stochastic formalism of cosmic inflation enables us to describe the large-scale dynamics non-perturbatively. Even in the slow-roll regime, however, it is in general difficult to solve the fundamental equations analytically due to the stochastic nature of fluctuations. I will present the two analytical methods in stochastic inflation. One is a class of all the possible exact solutions for a...
13. Extending Starobinsky's formalism to general relativity
Shun-Pei Miao
07/11/2024, 15:20

TBA
14. On the IR divergences in de Sitter: loops, resummation and the semi-classical wavefunction
Sebastian M.Cespedes Castillo
07/11/2024, 16:30

Detecting local Non-Gaussianity provides valuable insights into the early universe's particle composition. Interactions between the inflaton and light particles yield distinctive signatures, potentially observable in upcoming surveys. However, addressing IR divergences in light fields on de Sitter spacetimes requires careful treatment. Stochastic inflation offers a solution, but its...
15. Effective Treatment of Schwinger Pair Production during Axion Inflation
Tomohiro Fujita
07/11/2024, 17:10

TBA
16. Cosmological Information in Perturbative Forward Modeling
Giovanni Cabass
08/11/2024, 10:00

I discuss how well perturbative forward modeling can constrain cosmological parameters compared to conventional analyses. In perturbation theory the field-level posterior can be computed analytically in the limit of small noise. In the idealized case where the only relevant parameter for the nonlinear evolution is the nonlinear scale, I argue that information content in this posterior is the...
17. Implication of nonlinear-supersymmetric general relativity
Kazunari Shima
08/11/2024, 11:00

Considering (unstable) Riemann space-time whose tangent space possesses NLSUSY structure specified by fermionic coordinate ψαi (i=1…N)　and the ordinary Minkowski coordinates xa we can find the unified vierbein waμ and perform the ordinary geometric argument of the general relativity principle on such Riemann space-time and obtain straightforwardly new Einstein-Hilbert(EH)-type action LNLSGR...
21. Parity-Odd Power Spectra: Concise Statistics for Cosmological Parity Violation
Drew Jamieson
08/11/2024, 11:00

Discovering primordial parity violation would have profound implications for our understanding of early Universe physics and would greatly inform inflationary models. Recent evidence of cosmic parity violation in the four-point statistics of galaxy clustering is inconclusive due to uncertainty in observational systematics and covariance estimation. In this talk, I will present a new class of...
22. Alleviate S8 tension by introducing scale dependence beyond power-law in the primordial power spectrum
Ryo Terasawa
08/11/2024, 11:20

There is an approximately 2-sigma discrepancy between the S8 values measured from CMB and CMB lensing, which probe large scales, and the values measured from the weak lensing survey, which is sensitive to small scales. This discrepancy, known as the "S8 tension", can be regarded as a tension between large and small scales. These results are based on the standard LCDM model, which assumes a...
18. Non-linear treatment of cosmological perturbations
Danilo Artigas
08/11/2024, 11:20

Linear-perturbation theory has proven to be an extremely powerful tool to compare inflationary models with observational data. Recently, the newcoming high-precision observations call for predictions beyond linear perturbations. Such effects are known to be relevant for example in the production of primordial black holes or scalar-induced gravitational waves. The separate-universe approach...
23. Non-linear evolution of primordial parity violation
Shaghaiegh Azyzy
08/11/2024, 11:40

The discovery of parity violation in weak interactions dictated the structure of the standard model of particle physics. Recent hints of parity violation in the cosmic microwave background and large-scale structure of the universe make us wonder, whether parity can provide us any information about the mysteries of cosmology as well. In this talk, I will demonstrate, how primordial parity...
19. Stochastic inflation and entropy bound in de Sitter spacetime
Hiromasa Tajima
08/11/2024, 11:40

We analyze the entropy behavior of the de Sitter spacetime during the inflationary phase. A cosmological horizon in de Sitter spacetime that constrains the causally accessible region of an observer exhibits thermal properties analogous to the event horizon of a black hole. According to the principles of holography, the entropy within a causally connected region for an observer is limited by...
20. Primordial Black Hole Formation from Power Spectrum with Finite-width
Jianing Wang
08/11/2024, 12:00

Primordial Black Holes (PBHs) may be produced by gravitational collapse in regions with a large amplitude of density contrasts in the early Universe. They may provide the seeds for galaxy formation, account for a population of the LIGO-Virgo events, and the candidates of cold dark matter. The main purpose of our study is to develop a more accurate estimation for PBH abundance. We will address...
24. Scale-dependent galaxy bias in local-type primordial non-Gaussianities with heavy-tailed models
Takahiro Nishimichi
08/11/2024, 13:30

Scale-dependent bias is a crucial indicator in the late-time universe for understanding local-type primordial non-Gaussianities. Previous studies have focused on low-order non-Gaussian models characterized by the f_NL (second order), g_NL and tau_NL (third order) parameters, with forecasts made for upcoming large-scale galaxy surveys. In this talk, we extend this framework to models exhibiting...
25. Divide and Conquer the Cosmos: Patching Simulation beyond Separate Universe
Yin Li
08/11/2024, 14:10

The separate universe simulation account for the mean density mode, and the mean tidal modes too in its anisotropic extension. I will present some recent work on perfect parallel simulation accounting for all long-wavelength modes through boundary conditions.
26. On the bias renormalization in cosmological perturbation theory
Takahiko Matsubara
08/11/2024, 15:20

I would like to briefly discuss the renormalization schemes of conventional perturbation theory (also EFTofLSS) and that of integrated perturbation theory (i.e., renormalized bias functions in iPT).
27. Summary Talk
J. Richard Bond
08/11/2024, 16:00
1. EFT for inflation and LSS:
Mehardad Mirababai

TBA
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