6 papers
Multi-step phase transition and gravitational wave from general scalar extensions
Qing-Hong Cao, Katsuya Hashino, Xu-Xiang Li +1
Multi-step phase transition provides a paradigm in which a broken symmetry during phase transition can be restored, enriching the phenomena of both dark matter and baryon asymmetry…
RGE effects on new physics searches via gravitational waves
Katsuya Hashino, Daiki Ueda
Gravitational wave (GW) observations offer a promising probe of new physics associated with a first-order electroweak phase transition. Precision studies of the Higgs potential, in…
SMEFT effects on gravitational wave spectrum from electroweak phase transition
Katsuya Hashino, Daiki Ueda
Future gravitational wave observations are potentially sensitive to new physics corrections to the Higgs potential once the first-order electroweak phase transition arises. We stud…
Significance of soft-scale breaking on primordial black hole production in Coleman-Weinberg type supercooling-phase transition
He-Xu Zhang, Katsuya Hashino, Hiroyuki Ishida +1
Ultra-supercooling phase transitions can generate large overdensities in the Universe, potentially leading to the formation of primordial black holes (PBHs), which can also be a da…
Super-critical primordial black hole formation via delayed first-order electroweak phase transition
Katsuya Hashino, Shinya Kanemura, Tomo Takahashi +2
The delay of the first-order electroweak phase transitions (EWPT) may lead to the emergence of baby universes inside wormhole structures due to the large vacuum energy density in f…
Gravitational waves from patterns of electroweak symmetry breaking: an effective perspective
Rong-Gen Cai, Katsuya Hashino, Shao-Jiang Wang +1
The future space-borne gravitational wave (GW) detectors would provide a promising probe for the new physics beyond the standard model that admits the first-order phase transitions…