Nakao, Ken-ichi, Harada, Tomohiro, Kurita, Yasunari, Morisawa, Yoshiyuki
We numerically study the dynamics of an imploding hollow cylinder composed of dust. Since there is no cylindrical black hole in 4-dimensional spacetime with physically reasonable energy conditions, a...
Anabalon, Andres, Deruelle, Nathalie, Morisawa, Yoshiyuki, Oliva, Julio, Sasaki, Misao, Tempo, David, ...
As is well-known, Kerr-Schild metrics linearize the Einstein tensor. We shall see here that they also simplify the Gauss-Bonnet tensor, which turns out to be only quadratic in the arbitrary...
Charged Rotating Kaluza-Klein Black Holes Generated by G2(2) Transformation (2008)
Tomizawa, Shinya, Yasui, Yukinori, Morisawa, Yoshiyuki
Applying the G_{2(2)} generating technique for minimal D=5 supergravity to the Rasheed black hole solution, we present a new rotating charged Kaluza-Klein black hole solution to the five-dimensional...
Boundary Value Problem for Black Rings (2007)
Morisawa, Yoshiyuki, Tomizawa, Shinya, Yasui, Yukinori
We study the boundary value problem for asymptotically flat stationary black ring solutions to the five-dimensional vacuum Einstein equations. Assuming the existence of two additional commuting axial...
Cosmological Black Holes on Taub-NUT space in Five-Dimensional Einstein-Maxwell Theory (2007)
Ida, Daisuke, Ishihara, Hideki, Kimura, Masashi, Matsuno, Ken, Morisawa, Yoshiyuki, Tomizawa, Shinya
The cosmological black hole solution on the Gibbons-Hawking space has been constructed. We also investigate the properties of this solution in the case of a single black hole. Unlike the...
Relativistic Gravitational Collapse of a Cylindrical Shell of Dust (2006)
Nakao, Ken-ichi, Kurita, Yasunari, Morisawa, Yoshiyuki, Harada, Tomohiro
The gravitational collapse of a thick cylindrical shell of dust matter is investigated. It is found that a spacetime singularity forms on the symmetry axis and that it is necessarily naked, i.e.,...
Tomizawa, Shinya, Morisawa, Yoshiyuki, Yasui, Yukinori
We study stationary and axially symmetric two solitonic solutions of five dimensional vacuum Einstein equations by using the inverse scattering method developed by Belinski and Zakharov. In this...
Gravitational Radiation from Cylindrical Naked Singularity (2005)
Nakao, Ken-ichi, Morisawa, Yoshiyuki
We construct an approximate solution which describes the gravitational emission from a naked singularity formed by the gravitational collapse of a cylindrical thick shell composed of dust. The...
Scalar field perturbation on six-dimensional ultra-spinning black holes (2004)
Morisawa, Yoshiyuki, Ida, Daisuke
We have studied the scalar field perturbations on six-dimensional ultra-spinning black holes. We have numerically calculated the quasinormal modes of rotating black holes. Our results suggest that...
Mass and angular momenta of Kerr anti-de Sitter spacetimes in Einstein-Gauss-Bonnet theory (2004)
Deruelle, Nathalie, Morisawa, Yoshiyuki
We compute the mass and angular momenta of rotating anti-de Sitter spacetimes in Einstein-Gauss-Bonnet theory of gravity using a superpotential derived from standard Noether identities. The...
High-Speed Cylindrical Collapse of Perfect Fluid (2004)
Nakao, Ken-ichi, Morisawa, Yoshiyuki
The gravitational collapse of cylindrically distributed perfect fluid is studied. We assume the collapsing speed of fluid is very large and investigate such a situation by recently proposed...
A boundary value problem for the five-dimensional stationary rotating black holes (2004)
Morisawa, Yoshiyuki, Ida, Daisuke
We study the boundary value problem for the stationary rotating black hole solutions to the five-dimensional vacuum Einstein equation. Assuming the two commuting rotational symmetry and the...
High Speed Dynamics of Collapsing Cylindrical Dust Fluid (2003)
Nakao, Ken-ichi, Morisawa, Yoshiyuki
We construct approximate solutions that will describe the last stage of cylindrically symmetric gravitational collapse of dust fluid. Just before the spacetime singularity formation, the speed of the...
The scalar perturbation of the higher-dimensional rotating black holes (2002)
Ida, Daisuke, Uchida, Yuki, Morisawa, Yoshiyuki
The massless scalar field in the higher-dimensional Kerr black hole (Myers- Perry solution with a single rotation axis) has been investigated. It has been shown that the field equation is separable...
Thick domain walls around a black hole (2002)
Morisawa, Yoshiyuki, Ida, Daisuke, Ishibashi, Akihiro, Nakao, Ken-ichi
We discuss the gravitationally interacting system of a thick domain wall and a black hole. We numerically solve the scalar field equation in the Schwarzschild spacetime and obtain a sequence of...
Hidden symmetry of the three-dimensional Einstein-Maxwell equations (2001)
Ida, Daisuke, Morisawa, Yoshiyuki
It is shown how to generate three-dimensional Einstein-Maxwell fields from known ones in the presence of a hypersurface-orthogonal non-null Killing vector field. The continuous symmetry group is...
Excitation of Kaluza-Klein modes of U(1) field by parametric resonance (2000)
Morisawa, Yoshiyuki, Uzawa, Kunihito, Mukohyama, Shinji
In this paper, based on the theory of parametric resonance, we propose a cosmological criterion on ways of compactification: we rule out such a model of compactification that there exists a...
Thick Domain Walls Intersecting a Black Hole (2000)
Morisawa, Yoshiyuki, Yamazaki, Ryo, Ida, Daisuke, Ishibashi, Akihiro, Nakao, Ken-ichi
We discuss the gravitationally interacting system of a thick domain wall and a black hole. We numerically solve the scalar field equation in the Schwarzschild spacetime and show that there exist...
Excitation of Kaluza-Klein gravitational mode (1999)
Uzawa, Kunihito, Morisawa, Yoshiyuki, Mukohyama, Shinji
We investigate excitation of Kaluza-Klein modes due to the parametric resonance caused by oscillation of radius of compactification. We consider a gravitational perturbation around a D-dimensional...