235 citations · 2.2k across the 57 of their papers we have counts for
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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…
Early Decay of Peccei-Quinn Fermion and the IceCube Neutrino Events
Yohei Ema, Takeo Moroi
IceCube observed high-energy neutrino flux in the energy region from TeV to PeV. The decay of a massive long-lived particle in the early universe can be the origin of the IceCube n…
Gravitational Particle Production in Oscillating Background and Its Cosmological Implications
Yohei Ema, Ryusuke Jinno, Kyohei Mukaida +1
We study production of light particles due to oscillation of the Hubble parameter or the scale factor. Any coherently oscillating scalar field, irrespective of its energy fraction…
Fate of Electroweak Vacuum during Preheating
Yohei Ema, Kyohei Mukaida, Kazunori Nakayama
Our electroweak vacuum may be metastable in light of the current experimental data of the Higgs/top quark mass. If this is really the case, high-scale inflation models require a st…