4 papers
The generalized entropy in holographic semiclassical de Sitter spacetime
Akihiro Ishibashi, Kengo Maeda, Takashi Okamura
We consider generalized de Sitter entropy which includes both entanglement entropy of the strongly coupled quantum field and the gravitational Wald entropy in the framework of holo…
Instability thresholds for de Sitter and Minkowski spacetimes in holographic semiclassical gravity
Akihiro Ishibashi, Kengo Maeda, Takashi Okamura
We study the stability of -dimensional () de Sitter and Minkowski spacetimes within the framework of semiclassical gravity sourced by a strongly coupled quantum field w…
The higher dimensional instabilities of AdS in holographic semiclassical gravity
Akihiro Ishibashi, Kengo Maeda, Takashi Okamura
In the framework of AdS/CFT duality, we consider the semiclassical problem in general quadratic theory of gravity. We construct asymptotically global AdS and hyperbolic~(topologica…
Symmetry breaking of -dimensional AdS in holographic semiclassical gravity
Akihiro Ishibashi, Kengo Maeda, Takashi Okamura
We show that -dimensional AdS spacetime can be semiclassically unstable due to strongly interacting quantum field effects. In our previous paper, we have pointed out the possibi…