95 citations · 570 across the 24 of their papers we have counts for
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Quantum teleportation in vacuum using only Unruh-DeWitt detectors
Jun-ichirou Koga, Gen Kimura, Kengo Maeda
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 ge…
Inhomogeneous charged black hole solutions in asymptotically anti-de Sitter spacetime
Kengo Maeda, Takashi Okamura, Jun-ichirou Koga
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…
The final fate of instability of Reissner-Nordström-anti-de Sitter black holes by charged complex scalar fields
Kengo Maeda, Jun-ichirou Koga, Shunsuke Fujii
We investigate instability of 4-dimensional Reissner-Nordström-anti-de Sitter (RN-AdS) black holes with various topologies by charged scalar field perturbations. We numerically…
Asymptotic symmetries on Kerr--Newman horizon without anomaly of diffeomorphism invariance
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, whic…
Universal properties from local geometric structure of Killing horizon
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 struct…
Uniqueness of Self-Similar Asymptotically Friedmann-Robertson-Walker Spacetime in Brans-Dicke theory
Hideki Maeda, Jun-ichirou Koga, Kei-ichi Maeda
We investigate spherically symmetric self-similar solutions in Brans-Dicke theory. Assuming a perfect fluid with the equation of state , we show that there are…