431 citations · 3k across the 56 of their papers we have counts for
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Axiverse and Black Hole
Hideo Kodama, Hirotaka Yoshino
String theory/M-theory generally predicts that axionic fields with a broad mass spectrum extending below 10^{-10}eV are produced after compactification to four dimensions. These ax…
Parity Violation in Graviton Non-gaussianity
Jiro Soda, Hideo Kodama, Masato Nozawa
We study parity violation in graviton non-gaussianity generated during inflation. We develop a useful formalism to calculate graviton non-gaussianity. Using this formalism, we expl…
Perturbations and Stability of Static Black Holes in Higher Dimensions
Akihiro Ishibashi, Hideo Kodama
In this chapter we consider perturbations and stability of higher dimensional black holes focusing on the static background case. We first review a gauge-invariant formalism for li…
On the waterfall behavior in hybrid inflation
Hideo Kodama, Kazunori Kohri, Kazunori Nakayama
We revisit the hybrid inflation model focusing on the dynamics of the waterfall field in an analytical way. It is shown that inflation may last long enough during the waterfall reg…
The Gravitational Lensing Effect on the CMB Polarisation Anisotropy in the Λ-LTB Model
Hajime Goto, Hideo Kodama
A local void modifies the sky distribution pattern of the cosmic microwave background (CMB) polarisation by gravitational lensing and produces B-modes from E-modes for an off-cente…