10 papers
Inflaton Regeneration via Scalar Couplings: Generic Models and the Higgs Portal
Kunio Kaneta, Tomo Takahashi, Natsumi Watanabe
The standard cosmological paradigm assumes that the inflaton field becomes dynamically negligible during the post-reheating evolution of the Universe. We demonstrate that this assu…
Gravitational waves from supermassive right-handed neutrinos produced at preheating
Shinya Kanemura, Kunio Kaneta, Dibyendu Nanda
The post-inflationary production of supermassive particles can have profound implications for the thermal history of the universe and may leave observable imprints in the gravitati…
Radiative Corrections in Supergravity Models of Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
Supergravity provides the natural supersymmetric framework for early universe cosmology. A broad class of inflationary models in no-scale supergravity yields tree-level predictions…
Gravitational Production of Spin-3/2 Particles During Reheating
Kunio Kaneta, Wenqi Ke, Yann Mambrini +2
We compute the density of a spin- particle, the raritron, produced at the end of inflation due to gravitational interactions. We consider a background inflaton condensate…
Effects of Radiative Corrections on Starobinsky Inflation
John Ellis, Tony Gherghetta, Kunio Kaneta +2
We analyze radiative corrections to the Starobinsky model of inflation arising from self-interactions of the inflaton, and from its Yukawa couplings, , to matter fermions, and d…
Post-Reheating Inflaton Production as a Probe of Reheating Dynamics
Kunio Kaneta, Tomo Takahashi, Natsumi Watanabe
Cosmological reheating bridges the inflationary epoch and the hot big bang phase, yet its underlying dynamics remain poorly understood. In this work, we investigate a minimal scena…