242 citations · 1.3k across the 39 of their papers we have counts for
4 papers · 1 filter
Rolling in the Modulated Reheating Scenario
Naoya Kobayashi, Takeshi Kobayashi, Adrienne L. Erickcek
In the modulated reheating scenario, the field that drives inflation has a spatially varying decay rate, and the resulting inhomogeneous reheating process generates adiabatic pertu…
Isocurvature Constraints and Anharmonic Effects on QCD Axion Dark Matter
Takeshi Kobayashi, Ryosuke Kurematsu, Fuminobu Takahashi
We revisit the isocurvature density perturbations induced by quantum fluctuations of the axion field by extending a recently developed analytic method and approximations to a time-…
Spectator field models in light of spectral index after Planck
Takeshi Kobayashi, Fuminobu Takahashi, Tomo Takahashi +1
We revisit spectator field models including curvaton and modulated reheating scenarios, specifically focusing on their viability in the new Planck era, based on the derived express…
Large Tensor-to-Scalar Ratio in Small-Field Inflation
Takeshi Kobayashi, Tomo Takahashi
We show that density perturbations seeded by the inflaton can be suppressed when having additional light degrees of freedom contributing to the production of perturbations. The inf…