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...
Spacetime analogue of Bose-Einstein condensates: Bogoliubov-de Gennes formulation (2008)
Kurita, Yasunari, Kobayashi, Michikazu, Morinari, Takao, Tsubota, Makoto, Ishihara, Hideki
We construct quantum field theory in an analogue curved spacetime in Bose-Einstein condensates based on the Bogoliubov-de Gennes equations, by exactly relating quantum particles in curved spacetime...
Kurita, Yasunari, Ishihara, Hideki
We investigate thermodynamics constructed on different background reference spacetimes for squashed Kaluza-Klein (SqKK) black hole and electrically charged black string in five-dimensional...
New instability in relativistic cylindrically symmetric system (2007)
Nakao, Ken-ichi, Ida, Daisuke, Kurita, Yasunari
We investigate an infinitesimally thin cylindrical shell composed of counter-rotating dust particles. This system was studied by Apostolatos and Thorne in terms of the C-energy for a bounded domain....
Mass and Free energy in Thermodynamics of Squashed Kaluza-Klein Black Holes (2007)
Kurita, Yasunari, Ishihara, Hideki
The Abbott-Deser mass, the Hamiltonian and the Komar mass of the 5-dimensional Kaluza-Klein black hole with squashed horizons take different values. Introducing a new couple of thermodynamic...
Formation of a sonic horizon in isotropically expanding Bose-Einstein condensates (2007)
Kurita, Yasunari, Morinari, Takao
We propose a simple experiment to create a sonic horizon in isotropically trapped cold atoms within currently available experimental techniques. Numerical simulation of the Gross-Pitaevskii equation...
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.,...
Naked singularity resolution in cylindrical collapse (2005)
Kurita, Yasunari, Nakao, Ken-ichi
In this paper, we study the gravitational collapse of null dust in the cylindrically symmetric spacetime. The naked singularity necessarily forms at the symmetry axis. We consider the situation in...
Quasinormal Ringing for Acoustic Black Holes at Low Temperature (2004)
Nakano, Hiroyuki, Kurita, Yasunari, Ogawa, Kouji, Yoo, Chul-Moon
We investigate a condensed matter ``black hole'' analogue, taking the Gross-Pitaevskii (GP) equation as a starting point. The linearized GP equation corresponds to a wave equation on a black hole...
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...
CFT description of three-dimensional Hawking-Page transition (2004)
Kurita, Yasunari, Sakagami, Masa-aki
We construct a phenomenological conformal field theory (CFT) model of the three-dimensional Hawking-Page transition. We find that free fermion CFT models on the boundary torus give a description of...
Quasi-normal modes of D3-brane Black Holes (2002)
Kurita, Yasunari, Sakagami, Masa-aki
We investigate a method to evaluate quasi-normal modes of D3-brane black holes by wave interpretation of fields on D3-brane based on the Feynman's space-time approach. We perturbatively solve the...