242 citations · 3.5k across the 87 of their papers we have counts for
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On Longevity of I-ball/Oscillon
Kyohei Mukaida, Masahiro Takimoto, Masaki Yamada
We study I-balls/oscillons, which are long-lived, quasi-periodic, and spatially localized solutions in real scalar field theories. Contrary to the case of Q-balls, there is no evid…
Inflationary primordial black holes for the LIGO gravitational wave events and pulsar timing array experiments
Keisuke Inomata, Masahiro Kawasaki, Kyohei Mukaida +2
Primordial black holes (PBHs) are one of the candidates to explain the gravitational wave (GW) signals observed by the LIGO detectors. Among several phenomena in the early Universe…
Violent Preheating in Inflation with Nonminimal Coupling
Yohei Ema, Ryusuke Jinno, Kyohei Mukaida +1
We study particle production at the preheating era in inflation models with nonminimal coupling and quartic potential for several cases: real scalar inflaton, comp…
Nonthermal Gravitino Production after Large Field Inflation
Yohei Ema, Kyohei Mukaida, Kazunori Nakayama +1
We revisit the nonthermal gravitino production at the (p)reheating stage after inflation. Particular attention is paid to large field inflation models with a symmetr…
Electroweak Vacuum Stabilized by Moduli during/after Inflation
Yohei Ema, Kyohei Mukaida, Kazunori Nakayama
It is known that the present electroweak vacuum is likely to be metastable and it may lead to a serious instability during/after inflation. We propose a simple solution to the prob…
Simple Cosmological Solution to the Higgs Instability Problem in the Chaotic Inflation and Formation of Primordial Black Holes
Masahiro Kawasaki, Kyohei Mukaida, Tsutomu T. Yanagida
We revisit the compatibility between the chaotic inflation, which provides a natural solution to the initial condition problem, and the metastable electroweak vacuum, which is sugg…