24 citations · 45 across the 4 of their papers we have counts for
5 papers
How do late-time photons "record" primordial curvature perturbations?
Tomotaka Kuroda, Fumiya Sano, Yusuke Yamada
Inflationary cosmology faces a fundamental gap between primordial quantum fluctuations and the classical cosmic history inferred from observations. Although the primordial quantum…
Curvature-Assisted Dynamical Compactification in a Pre-Inflationary Higher-Dimensional Universe
Yusuke Yamada
We investigate a pre-inflationary dynamical compactification scenario in which a higher-dimensional expanding universe evolves into an effectively four-dimensional one through curv…
Proving the absence of large one-loop corrections to the power spectrum of curvature perturbations in transient ultra-slow-roll inflation within the path-integral approach
Ryodai Kawaguchi, Shinji Tsujikawa, Yusuke Yamada
We revisit one-loop corrections to the power spectrum of curvature perturbations in an inflationary scenario containing a transient ultra-slow-roll (USR) period. In Ref.[1], it…
Roles of boundary and equation-of-motion terms in cosmological correlation functions
Ryodai Kawaguchi, Shinji Tsujikawa, Yusuke Yamada
We revisit the properties of total time-derivative terms as well as terms proportional to the free equation of motion (EOM) in a Schwinger-Keldysh formalism. They are relevant to t…
Radiative correction on moduli stabilization in modular flavor symmetric models
Tatsuo Kobayashi, Kaito Nasu, Riku Sakuma +1
We study the radiative corrections to the stabilization of the complex structure modulus in modular flavor symmetric models. We discuss the possibility of obtaining the vacuum…