Ando, Masaki, Kawamura, Seiji, Sato, Shuichi, Nakamura, Takashi, Tsubono, Kimio, Araya, Akito, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory), which is a future space gravitational wave antenna. DECIGO is expected...
Ando, Masaki, Kawamura, Seiji, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECIGO pathfinder (DPF) is a milestone satellite mission for DECIGO (DECi-hertz Interferometer Gravitational wave Observatory) which is a future space gravitational wave antenna. DECIGO is expected...
The Japanese space gravitational wave antenna; DECIGO (2008)
Kawamura, Seiji, Ando, Masaki, Nakamura, Takashi, Tsubono, Kimio, Tanaka, Takahiro, Funaki, Ikkoh, ...
DECi-hertz Interferometer Gravitational wave Observatory (DECIGO) is the future Japanese space gravitational wave antenna. DECIGO is expected to open a new window of observation for gravitational...
Dynamics of colliding branes and black brane production (2007)
Takamizu, Yu-ichi, Kudoh, Hideaki, Maeda, Kei-ichi
We study the dynamics of colliding domain walls including self-gravity. The initial data is set up by applying a BPS domain wall in five-dimensional supergravity, and we evolve the system determining...
Doubly Spinning Black Rings (2006)
We study a method to solve stationary axisymmetric vacuum Einstein equations numerically. As an illustration, the five-dimensional doubly spinning black rings that have two independent angular...
New stable phase of non-uniform charged black strings (2006)
Miyamoto, Umpei, Kudoh, Hideaki
Non-uniform black strings coupled to a gauge field are constructed by a perturbative method in a wide range of spacetime dimensions. At the linear order of perturbations, we see that the...
Thermal Equilibrium of String Gas in Hagedorn Universe (2006)
Takamizu, Yu-ichi, Kudoh, Hideaki
The thermal equilibrium of string gas is necessary to activate the Brandenberger-Vafa mechanism, which makes our observed 4-dimensional universe enlarge. Nevertheless, the thermal equilibrium is not...
Himemoto, Yoshiaki, Taruya, Atsushi, Kudoh, Hideaki, Hiramatsu, Takashi
We discuss a robust data analysis method to detect a stochastic background of gravitational waves in the presence of non-Gaussian noise. In contrast to the standard cross-correlation (SCC) statistic...
Origin of black string instability (2006)
It is argued that many nonextremal black branes exhibit a classical Gregory-Laflamme (GL) instability. Why does the universal instability exist? To find an answer to this question and explore other...
Black hole production in tachyonic preheating (2006)
Suyama, Teruaki, Tanaka, Takahiro, Bassett, Bruce, Kudoh, Hideaki
We present fully non-linear simulations of a self-interacting scalar field in the early universe undergoing tachyonic preheating. We find that density perturbations on sub-horizon scales which are...
Detecting a gravitational-wave background with next-generation space interferometers (2005)
Kudoh, Hideaki, Taruya, Atsushi, Hiramatsu, Takashi, Himemoto, Yoshiaki
Future missions of gravitational-wave astronomy will be operated by space-based interferometers, covering very wide range of frequency. Search for stochastic gravitational-wave backgrounds (GWBs) is...
Gravitational Wave Background from Neutrino-Driven Gamma-Ray Bursts (2005)
Hiramatsu, Takashi, Kotake, Kei, Kudoh, Hideaki, Taruya, Atsushi
We discuss the gravitational wave background (GWB) from a cosmological population of gamma-ray bursts (GRBs). Among various emission mechanisms for the gravitational waves (GWs), we pay a particular...
Taruya, Atsushi, Kudoh, Hideaki
We present a perturbative reconstruction method to make a skymap of gravitational-wave backgrounds (GWBs) observed via space-based interferometer. In the presence of anisotropies in GWBs, the...
On non-uniform smeared black branes (2005)
Kudoh, Hideaki, Miyamoto, Umpei
We investigate charged dilatonic black $p$-branes smeared on a transverse circle. The system can be reduced to neutral vacuum black branes, and we perform static perturbations for the reduced system...
Quadrupole formula for Kaluza-Klein modes in the braneworld (2005)
Kinoshita, Shunichiro, Kudoh, Hideaki, Sendouda, Yuuiti, Sato, Katsuhiko
The quadrupole formula in four-dimensional Einstein gravity is a useful tool to describe gravitational wave radiation. We derive the quadrupole formula for the Kaluza-Klein (KK) modes in the...
Kudoh, Hideaki, Taruya, Atsushi
We discuss the sensitivity to anisotropies of stochastic gravitational-wave backgrounds (GWBs) observed via space-based interferometer. In addition to the unresolved galactic binaries as the most...
Are black holes over-produced during preheating? (2004)
Suyama, Teruaki, Tanaka, Takahiro, Bassett, Bruce, Kudoh, Hideaki
We provide a simple but robust argument that primordial black hole (PBH) production generically does {\em not} exceed astrophysical bounds during the resonant preheating phase after inflation. This...
Connecting black holes and black strings (2004)
Static vacuum spacetimes with one compact dimension include black holes with localised horizons but also uniform and non-uniform black strings where the horizon wraps over the compact dimension. We...
Thermodynamics of four-dimensional black objects in the warped compactification (2004)
Kudoh, Hideaki, Kurita, Yasunari
We reinvestigate the thermodynamics of black objects (holes and strings) in four-dimensional braneworld models that are originally constructed by Emparan, Horowitz and Myers based on the anti-de...
Six-dimensional localized black holes: numerical solutions (2004)
To test the strong-gravity regime in Randall-Sundrum braneworlds, we consider black holes bound to a brane. In a previous paper, we studied numerical solutions of localized black holes whose horizon...
Properties of Kaluza-Klein black holes (2003)
We detail numerical methods to compute the geometry of static vacuum black holes in 6 dimensional gravity compactified on a circle. We calculate properties of these Kaluza-Klein black holes for...
Thermodynamic Properties of Small Localized Black Holes (2003)
In a previous paper, we developed a numerical method to obtain a static black hole localized on a 3-brane in the Randall-Sundrum infinite braneworld, and presented examples of numerical solutions...
Primordial gravitational waves in inflationary braneworld (2003)
Kobayashi, Tsutomu, Kudoh, Hideaki, Tanaka, Takahiro
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 using a toy model given...
Small localized black holes in a braneworld: Formulation and numerical method (2003)
Kudoh, Hideaki, Tanaka, Takahiro, Nakamura, Takashi
No realistic black holes localized on a 3-brane in the Randall-Sundrum infinite braneworld have been found so far. The problem of finding a static black hole solution is reduced to a boundary value...
Gravity beyond linear perturbations in the braneworld (2002)
In the present paper, we briefly review recent studies of second-order gravitational perturbations in braneworld models. After we consider the possibility of pathological behavior of gravity at...
Kudoh, Hideaki, Tanaka, Takahiro
We discuss gravitational perturbations in the Randall-Sundrum two branes model with radius stabilization. Following the idea by Goldberger and Wise for the radius stabilization, we introduce a scalar...
Second order perturbations in the radius stabilized Randall-Sundrum two branes model (2001)
Kudoh, Hideaki, Tanaka, Takahiro
The nonlinear gravitational interaction is investigated in the Randall-Sundrum two branes model with the radius stabilization mechanism. As the stabilization model, we assume a single scalar field...
Second Order Perturbations in the Randall-Sundrum Infinite Brane-World Model (2001)
Kudoh, Hideaki, Tanaka, Takahiro
We discuss the non-linear gravitational interactions in the Randall-Sundrum single brane model. If we naively write down the 4-dimensional effective action integrating over the fifth dimension with...