Seminar detail: Higher dimensional instabilities of AdS in holographic semiclassical gravity

Date&Time	Tue May 20 2025 (17:00 - 18:00)
Speaker	Akihiro Ishibashi
Affiliation	QG lab, Nagoya University
Title	Higher dimensional instabilities of AdS in holographic semiclassical gravity
Abstract	In the AdS/CFT duality, we consider semiclassical problems in general quadratic theory of gravity. We construct asymptotically global AdS and hyperbolic (topological) AdS black hole solutions with non-trivial quantum hair in 4 and 5-dimensions by perturbing the maximally symmetric AdS solutions to the holographic semiclassical equations. We find that under certain conditions, our semiclassical solution of hyperbolic AdS black holes can be dynamically unstable against linear perturbations. In this holographic semiclassical context, we also study the thermodynamic instability of the hairy solutions in the 5-dimensional Gauss-Bonnet theory by computing the free energy and show that depending on the parameter of the Gauss-Bonnet theory, the free energy can be smaller than that of the background maximally symmetric AdS solution in both the global AdS and hyperbolic AdS black hole cases.
Remarks
Slide/Video	video1