KEK Theory Meeting on Particle Physics Phenomenology (KEK-PH2026winter)

Session

parallel session A: Cosmo

16 Feb 2026, 16:30

Seminar hall (San-go-kan (Building #3))

Conveners

parallel session A: Cosmo

• Fuminobu Takahashi

6. Walking-Dilaton Hybrid Inflation in a Model with Dynamical Scalegenesis

HIROYUKI ISHIDA

16/02/2026, 16:30

We propose a hybrid inflationary scenario based on eight-flavor hidden QCD with the hidden colored fermions being in part gauged under B−L gauge symmetry. This hidden QCD is almost scale-invariant, so-called walking, and predicts the light scalar meson (the walking dilaton) associated with the spontaneous scale breaking, which develops the Coleman-Weinberg (CW) type potential as the...

7. Emission of Nambu-Goldstone bosons from semilocal string networks

Yukihiro Kanda

16/02/2026, 16:50

Cosmic strings arise from the spontaneous breaking of a $U(1)$ symmetry, which can be either global or local, leading to distinct classes of string solutions. Their energy-loss mechanisms are known to differ significantly, which results in qualitatively different spectra of particles emitted from the string networks. Semilocal strings arise when global and local symmetries are simultaneously...

8. Relaxing Cosmological Constraints on the Minimal $U(1)_{L_\mu - L_\tau}$ Model with One-Loop Corrections

Jun Miyamoto

16/02/2026, 17:10

Recently, Ref.~\cite{...} showed that the minimal gauged $U(1)_{L_\mu - L_\tau}$ model is constrained by cosmological bounds on the sum of neutrino masses.
In this work, we compute the one-loop corrections to the neutrino mass matrix in this model and examine whether these cosmological constraints can be relaxed.