243 citations · 1.1k across the 23 of their papers we have counts for
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Bulk inflaton shadows of vacuum gravity
Tsutomu Kobayashi, Takahiro Tanaka
We introduce a -dimensional vacuum description of five-dimensional bulk inflaton models with exponential potentials that makes analysis of cosmological perturbations simple…
A new analytical method for self-force regularization I. scalar charged particle in Schwarzschild spacetime
Wataru Hikida, Sanjay Jhingan, Hiroyuki Nakano +3
We formulate a new analytical method for regularizing the self-force acting on a particle of small mass orbiting a black hole of mass , where . At first order in …
Weak gravity in DGP braneworld model
Takahiro Tanaka
We analyze the weak gravity in the braneworld model proposed by Dvali-Gabadadze-Porrati, in which the unperturbed background spacetime is given by five dimensional Minkowski bulk w…
Primordial gravitational waves in inflationary braneworld
Tsutomu Kobayashi, Hideaki Kudoh, Takahiro Tanaka
We study primordial gravitational waves from inflation in Randall-Sundrum braneworld model. The effect of small change of the Hubble parameter during inflation is investigated usin…
Gravitational Waves from Sub-lunar Mass Primordial Black Hole Binaries - A New Probe of Extradimensions
Kaiki Taro Inoue, Takahiro Tanaka
In many braneworld models, gravity is largely modified at the electro-weak scale ~ 1TeV. In such models, primordial black holes (PBHs) with lunar mass M ~ 10^{-7}M_sun might have b…
Application of the Separate Universe Approach to Preheating
Takahiro Tanaka, Bruce Bassett
The dynamics of preheating after inflation has not been clearly understood yet.In particular, the issue of the generation of metric perturbations during preheating on super-horizon…