423 citations · 1.8k across the 30 of their papers we have counts for
4 papers · 1 filter
Hawking-Moss instanton in nonlinear massive gravity
Ying-li Zhang, Ryo Saito, Misao Sasaki
As a first step toward understanding a lanscape of vacua in a theory of non-linear massive gravity, we consider a landscape of a single scalar field and study tunneling between a p…
Femto-lensing due to a Cosmic String
Chul-Moon Yoo, Ryo Saito, Yuuiti Sendouda +2
We consider the femto-lensing due to a cosmic string. If a cosmic string with the deficit angle [femto-arcsec] [rad] exists around the line of sight to a…
Resonant Signatures of Heavy Scalar Fields in the Cosmic Microwave Background
Ryo Saito, Masahiro Nakashima, Yu-ichi Takamizu +1
We investigate the possibility that a heavy scalar field, whose mass exceeds the Hubble scale during inflation, could leave non-negligible signatures in the Cosmic Microwave Backgr…
Gravitational Wave Probe of High Supersymmetry Breaking Scale
Ryo Saito, Satoshi Shirai
A supersymmetric standard model with heavier scalar particles is very interesting from various viewpoints, especially Higgs properties. If the scalar mass scale is O(10-10^4) TeV,…