8 citations · 12 across the 11 of their papers we have counts for
11 papers
Dark Transport Erases Baryon Inhomogeneity from Supercooled Phase Transitions
Sudhakantha Girmohanta, Kohei Kamada, Yuichiro Nakai +1
Supercooled phase transitions can generate observable gravitational waves, but their bubble dynamics may also imprint large spatial inhomogeneities in the baryon asymmetry. For pha…
3-form dark energy and cosmic birefringence
Kohei Kamada, Tucker Manton
3-forms are interesting fields to study in the cosmological context for numerous reasons, such as being candidates for explaining inflation and dark energy. The background evolutio…
Large lepton asymmetry from axion inflation and helium abundance hinted by ACT
Di Wu, Yifan Hu, Kohei Kamada
The generation of helical magnetic fields and the associated chiral asymmetry via the chiral anomaly is a generic feature in pseudoscalar inflation. In the presence of a Chern--Sim…
Magnetic Helicity, Magnetic Monopoles, and Higgs Winding
Hajime Fukuda, Yuta Hamada, Kohei Kamada +2
Changes in magnetic helicity are often discussed across a variety of fields, from condensed matter physics to early universe cosmology. It is frequently stated that the helicity ch…
Gravitational waves from metastable cosmic strings in the delayed scaling scenario
Yifan Hu, Kohei Kamada
Recent observations by pulsar timing arrays (PTAs) such as NANOGrav, EPTA, PPTA, and CPTA suggest the presence of nanohertz stochastic gravitational wave background (GWB). While su…
Self-similar inverse cascade from generalized symmetries
Yuji Hirono, Kohei Kamada, Naoki Yamamoto +1
We investigate the role of generalized symmetries in driving non-equilibrium and non-linear phenomena, specifically focusing on turbulent systems. While conventional turbulence stu…
Revisiting constraints on primordial magnetic fields from spectral distortions of cosmic microwave background
Fumio Uchida, Kohei Kamada, Hiroyuki Tashiro
The magneto-hydrodynamic decay of primordial magnetic fields can distort the black-body spectrum of the cosmic microwave background (CMB) by draining magnetic energy into thermal p…
Leptogenesis from magnetic helicity of gauged
Hajime Fukuda, Kohei Kamada, Thanaporn Sichanugrist
If the symmetry is gauged with the addition of right-handed neutrinos, the standard model current is anomalous with respect to the gauge field itself. Then, the a…
phase ambiguity of cosmic birefringence
Fumihiro Naokawa, Toshiya Namikawa, Kai Murai +2
We point out that the rotation angle of cosmic birefringence, which is a recently reported parity-violating signal in the cosmic microwave background (CMB), has a phase ambigui…
On the inefficiency of fermion level-crossing under the parity-violating spin-2 gravitational field
Kohei Kamada, Jun'ya Kume
Gravitational chiral anomaly connects the topological charge of spacetime and the chirality of fermions. It has been known that the chirality is carried by the particles (or the ex…
Modeling the core-halo mass relation in fuzzy dark matter halos
Hiroki Kawai, Ayuki Kamada, Kohei Kamada +1
Fuzzy dark matter (FDM) is an intriguing candidate alternative to the standard cold dark matter (CDM). The FDM model predicts that dark halos have characteristic core structures ge…