131 citations · 260 across the 3 of their papers we have counts for
10 papers
Unified approach to secondary effects on the CMB B-mode polarization
Toshiya Namikawa, Atsushi Naruko, Ryo Saito +2
We develop a systematic and unified approach to estimate all possible secondary (i.e. non-primordial) nonlinear effects to the cosmic microwave background (CMB) polarization, named…
Dynamical Analysis of Screening in Scalar-Tensor Theory
Tomohiro Nakamura, Taishi Ikeda, Ryo Saito +2
We investigate linear and non-linear dynamics of spherically symmetric perturbations on a static configuration in scalar-tensor theories focusing on the chameleon screening mechani…
Local gravity test of unified models of inflation and dark energy in gravity
Mai Yashiki, Nobuyuki Sakai, Ryo Saito
We consider gravity theories which unify inflation and dark energy models. First, from the final Planck data of the cosmic microwave background, we obtain a condition,…
Is Trans-Planckian Censorship a Swampland Conjecture?
Ryo Saito, Satoshi Shirai, Masahito Yamazaki
During an accelerated expansion of the Universe, quantum fluctuations of sub-Planckian size can be stretched outside the horizon and be regarded effectively classical. Recently, it…
Phenomenological Consequences of the Refined Swampland Conjecture
Hajime Fukuda, Ryo Saito, Satoshi Shirai +1
We discuss phenomenological consequences of the recently-introduced refinements of the de Sitter swampland conjecture. The conjecture constraints the first and the second derivativ…
Heavy Particle Signatures in Cosmological Correlation Functions with Tensor Modes
Ryo Saito, Takahiro Kubota
We explore the possibility to make use of cosmological data to look for signatures of unknown heavy particles whose masses are on the order of the Hubble parameter during the time…