New Charged Black Holes with Conformal Scalar Hair (2009)
Anabalon, Andres, Maeda, Hideki
A new class of four-dimensional, hairy, stationary solutions of the Einstein-Maxwell-$\Lambda$ system with a conformally coupled scalar field is constructed in this paper. The metric belongs to the...
Maeda, Hideki, Harada, Tomohiro, Carr, B. J.
Motivated by the cosmological wormhole solutions obtained from our recent numerical investigations, we provide a definition of a wormhole which applies to dynamical situations. Our numerical...
Lovelock black holes with a nonlinear Maxwell field (2008)
Maeda, Hideki, Hassaine, Mokhtar, Martinez, Cristian
We derive electrically charged black hole solutions of the Einstein-Gauss-Bonnet equations with a nonlinear electrodynamics source in $n (\ge 5)$ dimensions. The spacetimes are given as a warped...
Simple analytic model of wormhole formation (2008)
An explicit and simple solution representing the wormhole formation is presented. The spacetime is constructed by gluing the Minkowski and Roberts spacetimes at null hypersurfaces in a regular...
Universal slow fall-off to the unique AdS infinity in Einstein-Gauss-Bonnet gravity (2008)
In this paper, the following two propositions are proven under the dominant energy condition for the matter field in the higher-dimensional spherically symmetric spacetime in Einstein-Gauss-Bonnet...
Asymptotically Friedmann self-similar scalar field solutions with potential (2008)
Kyo, Masanori, Harada, Tomohiro, Maeda, Hideki
We investigate self-similar solutions which are asymptotic to the Friedmann universe at spatial infinity and contain a scalar field with potential. The potential is required to be exponential by...
Static and symmetric wormholes respecting energy conditions in Einstein-Gauss-Bonnet gravity (2008)
Properties of $n(\ge 5)$-dimensional static wormhole solutions are investigated in Einstein-Gauss-Bonnet gravity with or without a cosmological constant $\Lambda$. We assume that the spacetime has...
Function approximation approach to the inference of reduced NGnet models of genetic networks (2008)
Kimura, Shuhei, Sonoda, Katsuki, Yamane, Soichiro, Maeda, Hideki, Matsumura, Koki, Hatakeyama, Mariko
Abstract Background The inference of a genetic network is a problem in which mutual interactions among genes are deduced using time-series of gene expression patterns. While a number of models have...
Dynamical black holes with symmetry in Einstein-Gauss-Bonnet gravity (2007)
We explore various aspects of dynamical black holes defined by a future outer trapping horizon in $n(\ge 5)$-dimensional Einstein-Gauss-Bonnet gravity. In the present paper, we assume that the...
Generalized Misner-Sharp quasi-local mass in Einstein-Gauss-Bonnet gravity (2007)
We investigate properties of a quasi-local mass in a higher-dimensional spacetime having symmetries corresponding to the isomertries of an $(n-2)$-dimensional maximally symmetric space in...
Braneworld dynamics in Einstein-Gauss-Bonnet gravity (2007)
Maeda, Hideki, Sahni, Varun, Shtanov, Yuri
We discuss the cosmological evolution of a braneworld in five dimensional Gauss-Bonnet gravity. Our discussion allows the fifth (bulk) dimension to be space-like as well as time-like. The resulting...
Self-similar cosmological solutions with dark energy. I: formulation and asymptotic analysis (2007)
Harada, Tomohiro, Maeda, Hideki, Carr, B. J.
Based on the asymptotic analysis of ordinary differential equations, we classify all spherically symmetric self-similar solutions to the Einstein equations which are asymptotically Friedmann at large...
Maeda, Hideki, Harada, Tomohiro, Carr, B. J.
We use a combination of numerical and analytical methods, exploiting the equations derived in a preceding paper, to classify all spherically symmetric self-similar solutions which are asymptotically...
Black Hole Evaporation in an Expanding Universe (2007)
Saida, Hiromi, Harada, Tomohiro, Maeda, Hideki
We calculate the quantum radiation power of black holes which are asymptotic to the Einstein-de Sitter universe at spatial and null infinities. We consider two limiting mass accretion scenarios, no...
Origin of matter out of pure curvature (2007)
Dadhich, Naresh, Maeda, Hideki
We propose a mechanism for origin of matter in the universe in the framework of Einstein-Gauss-Bonnet gravity in higher dimensions. The recently discovered new static black hole solution by the...
We discuss the physical interpretation of a dynamical and inhomogeneous spherically symmetric solution obtained by Fonarev for a scalar field with an exponential potential. There is a single...
Matter without matter: novel Kaluza-Klein spacetime in Einstein-Gauss-Bonnet gravity (2006)
Maeda, Hideki, Dadhich, Naresh
We consider Einstein-Gauss-Bonnet gravity in $n(\ge 6)$-dimensional Kaluza-Klein spacetime ${\ma M}^{4} \times {\ma K}^{n-4}$, where ${\ma K}^{n-4}$ is the Einstein space with negative curvature. In...
Maeda, Hideki, Dadhich, Naresh
We obtain a new exact black-hole solution in Einstein-Gauss-Bonnet gravity with a cosmological constant which bears a specific relation to the Gauss-Bonnet coupling constant. The spacetime is a...
Harada, Tomohiro, Maeda, Hideki, Carr, B. J.
We consider the possible existence of self-similar solutions containing black holes in a Friedmann background with a stiff fluid or a scalar field. We carefully study the relationship between the...
We give a model of the higher-dimensional spherically symmetric gravitational collapse of a dust cloud in Einstein-Gauss-Bonnet gravity. A simple formulation of the basic equations is given for the...
We find an exact solution in dimensionally continued gravity in arbitrary dimensions which describes the gravitational collapse of a null dust fluid. Considering the situation that a null dust fluid...
Spacetime structure of static solutions in Gauss-Bonnet gravity: charged case (2005)
We have studied spacetime structures of static solutions in the $n$-dimensional Einstein-Gauss-Bonnet-Maxwell-$\Lambda$ system. Especially we focus on effects of the Maxwell charge. We assume that...
Spacetime structure of static solutions in Gauss-Bonnet gravity: neutral case (2005)
We study the spacetime structures of the static solutions in the $n$-dimensional Einstein-Gauss-Bonnet-$\Lambda$ system systematically. We assume the Gauss-Bonnet coefficient $\alpha$ is...
Effects of Gauss-Bonnet term on the final fate of gravitational collapse (2005)
We obtain a general spherically symmetric solution of a null dust fluid in $n (\geq 4)$-dimensions in Gauss-Bonnet gravity. This solution is a generalization of the $n$-dimensional Vaidya-(anti)de...
Novel Cauchy-horizon instability (2005)
Maeda, Hideki, Torii, Takashi, Harada, Tomohiro
The evolution of weak discontinuity is investigated on horizons in the $n$-dimensional static solutions in the Einstein-Maxwell-scalar-$\Lambda$ system, including the Reissner-Nordstr\"om-(anti) de...
Kink instability and stabilization of the Friedmann universe with scalar fields (2004)
Maeda, Hideki, Harada, Tomohiro
The evolution of weak discontinuity is investigated in the flat FRW universe with a single scalar field and with multiple scalar fields. We consider both massless scalar fields and scalar fields with...
Quantum Effect and Curvature Strength of Naked Singularities (2004)
Miyamoto, Umpei, Maeda, Hideki, Harada, Tomohiro
There are many solutions to the Einstein field equations that demonstrate naked singularity (NS) formation after regular evolution. It is possible, however, that such a quantum effect as particle...
Kinematic self-similar solutions in general relativity (2004)
Maeda, Hideki, Harada, Tomohiro
The gravitational interaction is scale-free in both Newtonian gravity and general theory of relativity. The concept of self-similarity arises from this nature. Self-similar solutions reproduce...
Horizon Instability: a Local Analysis (2004)
Maeda, Hideki; Advanced Research Institute For Science And Engineering, Was; Hideki@gravity.phys.waseda.ac.jp, Torii, Takashi; Graduate School Of Science, Waseda University, Tokyo; Torii@gravity.phys.waseda.ac.jp, Harada, Tomohiro; School Of Mathematical Sciences, Queen Mary, University Of London; T.Harada@qmul.ac.uk
The evolution of weak discontinuity is investigated on horizons in the n-dimensional static solutions in the Einstein-Maxwell-scalar-\Lambda system, including the Reissner-Nordstr"om-(anti) de Sitter...
Harada, Tomohiro, Maeda, Hideki
A stability criterion is derived in general relativity for self-similar solutions with a scalar field and those with a stiff fluid, which is a perfect fluid with the equation of state $P=\rho$. A...
A Classification of Spherically Symmetric Kinematic Self-Similar Perfect-Fluid Solutions. II (2003)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We give a classification of spherically symmetric kinematic self-similar solutions. This classification is complementary to that given in a previous work by the present authors [Prog. Theor. Phys....
One more mechanism of electric charge non-conservation (2002)
Dolgov, Alexander D., Maeda, Hideki, Torii, Takashi
If photon mass is not exactly zero, though arbitrary small, electric charge would not be conserved in interaction of charged particles with black holes. Manifestations of such mechanism of electric...
Criticality and convergence in Newtonian collapse (2002)
Harada, Tomohiro, Maeda, Hideki, Semelin, Benoit
We study through numerical simulation the spherical collapse of isothermal gas in Newtonian gravity. We observe a critical behavior which occurs at the threshold of gravitational instability leading...
A Classification of Spherically Symmetric Kinematic Self-Similar Perfect-Fluid Solutions (2002)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We classify all spherically symmetric spacetimes admitting a kinematic self-similar vector of the second, zeroth or infinite kind. We assume that the perfect fluid obeys either a polytropic equation...
Maeda, Hideki, Koga, Jun-ichirou, Maeda, Kei-ichi
We investigate spherically symmetric self-similar solutions in Brans-Dicke theory. Assuming a perfect fluid with the equation of state $p=(\gamma-1)\mu (1 \le \gamma
No Go Theorem for Kinematic Self-Similarity with A Polytropic Equation of State (2002)
Maeda, Hideki, Harada, Tomohiro, Iguchi, Hideo, Okuyama, Naoya
We have investigated spherically symmetric spacetimes which contain a perfect fluid obeying the polytropic equation of state and admit a kinematic self-similar vector of the second kind which is...
Critical phenomena in Newtonian gravity (2001)
Maeda, Hideki, Harada, Tomohiro
We investigate the stability of self-similar solutions for a gravitationally collapsing isothermal sphere in Newtonian gravity by means of a normal mode analysis. It is found that the Hunter series...
Convergence to a self-similar solution in general relativistic gravitational collapse (2001)
Harada, Tomohiro, Maeda, Hideki
We study the spherical collapse of a perfect fluid with an equation of state $P=k\rho$ by full general relativistic numerical simulations. For $0
Terada, Tomoyuki, Oshida, Takuya, Nishimura, Masuhiro, Maeda, Hideki, Hara, Taizo, Hosomi, Saburo, ...
Thioltransferase, an enzyme which catalyzes the thiol/disulfide exchange reaction in the presence of GSH, was purified to homogeneity on 15% SDS-PAGE from human (36,000-fold purification) and bovine...
Function approximation approach to the inference of reduced NGnet models of genetic networks
Kimura, Shuhei, Sonoda, Katsuki, Yamane, Soichiro, Maeda, Hideki, Matsumura, Koki, Hatakeyama, Mariko
New Charged Black Holes with Conformal Scalar Hair
Anabalon, Andres, Maeda, Hideki
A general class of four dimensional, stationary solutions of the Einstein-Maxwell system with a conformally coupled scalar field is constructed in this paper. The stationary case is presented and...