A Master Equation for Gravitational Perturbations of Maximally Symmetric Black Holes in Higher Dimensions
- H. Kodama, A. Ishibashi
- Physics
- 16 May 2003
We show that in four or more spacetime dimensions, the Einstein equations for gravitational perturbations of maximally symmetric vacuum black holes can be reduced to a single second-order wave…
Cosmological Perturbation Theory
The linear perturbation theory of spatially homogeneous and isotropic universes is reviewed and reformulated extensively. In the first half of the article, a gauge-invariant formulation of the theory…
Master Equations for Perturbations of Generalised Static Black Holes with Charge in Higher Dimensions
- H. Kodama, A. Ishibashi
- Physics
- 20 August 2003
We extend the formulation for perturbations of maximally symmetric black holes in higher dimensions developed by the present authors in a previous paper to a charged black hole background whose…
Brane world cosmology: Gauge invariant formalism for perturbation
- H. Kodama, A. Ishibashi, O. Seto
- Physics
- 24 April 2000
In the present paper the gauge-invariant formalism is developed for perturbations of the brane-world model in which our universe is realized as a boundary of a higher-dimensional spacetime. For the…
Conserved Energy Flux for the Spherically Symmetric System and the Backreaction Problem in the Black Hole Evaporation
- H. Kodama
- Physics
- 1 April 1980
For the spherically symmetric system, we prove the existence o{ a new locally cotEen·ecl flux which can be interpreted to represent the total energy flux of matter and gravitational field. ·with the…
Stability of Higher-Dimensional Schwarzschild Black Holes
- A. Ishibashi, H. Kodama
- Physics
- 20 May 2003
We investigate the classical stability of higher-dimensional Schwarzschild black holes with respect to linear perturbations in the framework of a gauge-invariant formalism for gravitational…
Automatic method for fabricating a three‐dimensional plastic model with photo‐hardening polymer
- H. Kodama
- Materials Science, Engineering
- 1 November 1981
A new method for automatic fabrication of a three‐dimensional plastic model is presented. A solid model is fabricated by exposing liquid photo‐hardening polymer to ultraviolet rays, and stacking the…
Gravitational radiation from an axion cloud around a black hole: Superradiant phase
- H. Yoshino, H. Kodama
- Physics
- 9 December 2013
Motivated by the possible existence of string axions with ultralight masses, we study gravitational radiation from an axion cloud around a rotating black hole (BH). The axion cloud extracts the…
Entanglement thermodynamics
- S. Mukohyama, M. Seriu, H. Kodama
- Physics
- 13 February 1998
Entanglement entropy is a statistical entropy measuring information loss due to coarse-graining corresponding to a spatial division of a system. In this paper we construct a thermodynamics…
Parity violation in graviton non-gaussianity
- J. Soda, H. Kodama, Masato Nozawa
- Physics
- 16 June 2011
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 explicitly calculate…
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