535 citations · 1.3k across the 26 of their papers we have counts for
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Implications of tachyonic phase transition in classically scale invariant general models
Arindam Das, Katsuya Hashino, Yuta Orikasa +1
We investigate the complementarity between collider searches and gravitational-wave (GW) observations in the classically scale-invariant general extension of the Standard…
Interplay between decoupling and non-decoupling effective field theories in electroweak phase transitions
Katsuya Hashino, Daiki Ueda
Gravitational-wave (GW) observations offer a promising probe of new physics associated with a strong first-order electroweak phase transition. Null results from direct searches and…
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…
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…
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 first-order phase transition in an electroweakly interacting vector dark matter model
Tomohiro Abe, Katsuya Hashino
We discuss gravitational waves in an electroweakly interacting vector dark matter model. In the model, the electroweak gauge symmetry is extended to SU(2) SU(2)$_1 \time…
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…
Probing first-order electroweak phase transition via primordial black holes in the effective field theory
Katsuya Hashino, Shinya Kanemura, Tomo Takahashi +1
We investigate production of primordial black holes from first-order electroweak phase transition in the framework of the nearly aligned Higgs effective field theory, in which non-…
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…
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…
Primordial black holes as a probe of strongly first-order electroweak phase transition
Katsuya Hashino, Shinya Kanemura, Tomo Takahashi
Primordial black holes can be produced by density fluctuations generated from delayed vacuum decays of first-order phase transition. The primordial black holes generated at the ele…
Dark matter transient annihilations in the early Universe
Katsuya Hashino, Jia Liu, Xiao-Ping Wang +1
The cosmological evolution can modify the dark matter (DM) properties in the early Universe to be vastly different from the properties today. Therefore, the relation between the re…
Electroweak phase transition triggered by fermion sector
Qing-Hong Cao, Katsuya Hashino, Xu-Xiang Li +2
To realize first-order electroweak phase transition, it is necessary to generate a barrier in the thermal Higgs potential, which is usually triggered by scalar degree of freedom. W…
Fingerprinting models of first-order phase transitions by the synergy between collider and gravitational-wave experiments
Katsuya Hashino, Ryusuke Jinno, Mitsuru Kakizaki +3
We investigate the sensitivity of future space-based interferometers such as LISA and DECIGO to the parameters of new particle physics models which drive a first-order phase transi…
Gravitational Waves from Phase Transitions in Models with Charged Singlets
Amine Ahriche, Katsuya Hashino, Shinya Kanemura +1
We investigate the effect of extra singlets on the electroweak phase transition (EWPT) strength and the spectrum of the corresponding gravitational waves (GWs). We consider here th…
Probing CP violating Higgs sectors via the precision measurement of coupling constants
Mayumi Aoki, Katsuya Hashino, Daiki Kaneko +2
We study how effects of the CP violation can be observed indirectly by precision measurements of Higgs boson couplings at a future Higgs factory such as the international linear co…
Gravitational waves from first order electroweak phase transition in models with the gauge symmetry
Katsuya Hashino, Mitsuru Kakizaki, Shinya Kanemura +2
We consider a standard model extension equipped with a dark sector where the Abelian gauge symmetry is spontaneously broken by the dark Higgs mechanism. In this framewo…
Gravitational waves and Higgs boson couplings for exploring first order phase transition in the model with a singlet scalar field
Katsuya Hashino, Mitsuru Kakizaki, Shinya Kanemura +2
We calculate the spectrum of gravitational waves originated from strongly first order electroweak phase transition in the extended Higgs model with a real singlet field. In order t…
Synergy between measurements of the gravitational wave and the triple Higgs coupling in probing first order phase transition
Katsuya Hashino, Mitsuru Kakizaki, Shinya Kanemura +1
Probing the Higgs potential and new physics behind the electroweak symmetry breaking is one of the most important issues of particle physics. In particular, nature of electroweak p…
Discriminative phenomenological features of scale invariant models for electroweak symmetry breaking
Katsuya Hashino, Shinya Kanemura, Yuta Orikasa
Classical scale invariance (CSI) may be one of the solutions for the hierarchy problem. Realistic models for electroweak symmetry breaking based on CSI require extended scalar sect…