Zobrazeno 1 - 10
of 20
pro vyhledávání: '"Jun Ichirou Koga"'
Publikováno v:
Physical Review D. 100
We consider a pair of two-level Unruh-DeWitt detectors accelerated uniformly in the Minkowski vacuum of a massless neutral scalar field, and analyze, within the perturbation theory, the entanglement extracted from the vacuum into the Unruh-DeWitt det
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::e966175924e6a3e01b4143e450809008
https://doi.org/10.1103/physrevd.100.065013
https://doi.org/10.1103/physrevd.100.065013
Publikováno v:
Physical Review A. 97
We consider entanglement extraction into two two-level Unruh-DeWitt detectors from a vacuum of a neutral massless quantum scalar field in a four-dimensional spacetime, where the general monopole coupling to the scalar field is assumed. Based on the r
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a522a77e6c8eca5b4c893b9ea9b8e070
https://doi.org/10.1103/physreva.97.062338
https://doi.org/10.1103/physreva.97.062338
We investigate an anisotropic model of superconductors in the Einstein-Maxwell-dilaton theory with a charged scalar field. It is found that the critical temperature decreases as the anisotropy becomes large. We then estimate the energy gap of the sup
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::1a79bd88a6dc1c4996092dde9efd4617
Autor:
Keiichi Maeda, Jun Ichirou Koga
Publikováno v:
Physical Review D. 52:7066-7079
We study both spherically symmetric and rotating black holes with dilaton coupling and discuss the evaporation of these black holes via Hawking's quantum radiation and their fates. We find that the dilaton coupling constant $\alpha$ drastically affec
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6f6805227bd98e4829637012351d1184
https://doi.org/10.1103/physrevd.52.7066
https://doi.org/10.1103/physrevd.52.7066
Autor:
Jun-ichirou Koga, Keiichi Maeda
Publikováno v:
Physics Letters B. 340:29-34
We consider a superradiance effect around rotating dilatonic black holes. We analyze two cases: one is an exact solution with the coupling constant $\alpha=\sqrt{3}$, which effective action is reduced from the 5-dimensional Kaluza-Klein theory, and t
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::a3a76bd351624cc365f8177fafb80249
https://doi.org/10.1016/0370-2693(94)91293-9
https://doi.org/10.1016/0370-2693(94)91293-9
We investigate static inhomogeneous charged planar black hole solutions of the Einstein-Maxwell system in an asymptotically anti-de Sitter spacetime. Within the framework of linear perturbations, the solutions are numerically and analytically constru
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::8aaeae5d05ec15b9414971c1f07fe2c2
We investigate instability of 4-dimensional Reissner-Nordstr\"om-anti-de Sitter (RN-AdS$_4$) black holes with various topologies by charged scalar field perturbations. We numerically find that the RN-AdS$_4$ black holes become unstable against the li
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::9ae3d9dd69d6868bd9689a707d20200a
http://arxiv.org/abs/1003.2689
http://arxiv.org/abs/1003.2689
Autor:
Jun-ichirou Koga
We consider universal properties that arise from a local geometric structure of a Killing horizon. We first introduce a non-perturbative definition of such a local geometric structure, which we call an asymptotic Killing horizon. It is shown that inf
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::53bf5b1518416cf906b378a176d7b5b1
http://arxiv.org/abs/gr-qc/0604054
http://arxiv.org/abs/gr-qc/0604054
Autor:
Jun-ichirou Koga
We analyze asymptotic symmetries on the Killing horizon of the four-dimensional Kerr--Newman black hole. We first derive the asymptotic Killing vectors on the Killing horizon, which describe the asymptotic symmetries, and find that the general form o
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c5c2b7f8a6524072683fcdf80329119a
Autor:
Jun-ichirou Koga
Publikováno v:
Physical Review D. 72
We consider the first law of black hole thermodynamics in an asymptotically anti-de Sitter spacetime in the class of gravitational theories whose gravitational Lagrangian is an arbitrary function of the Ricci scalar. We first show that the conserved
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d40b808e43a51d895417cf97815aa6f3
https://doi.org/10.1103/physrevd.72.064010
https://doi.org/10.1103/physrevd.72.064010