We analyze the stability of the Euclidean Witten black hole (the cigar soliton in mathematics literature) under first-order renormalization group (Ricci) flow of the world-sheet sigma model. This analysis is from the target ...

We consider spherically symmetric spacetimes sourced by a fluid with pressure anisotropy in the radial direction. We use gauge-invariant perturbation theory to study the stability of this class of spacetimes under axial ...

In this work, we analyze the necessary conditions for a nonlinear anti–de Sitter (AdS)-type instability in the gravity-scalar field system. In particular, we discuss the necessary conditions for a cascade of energy to ...

We analyze the semiclassical stability of the Schwarzschild AdS black hole in the Euclidean partition function approach. We perform this computation in the large D limit and focus on scalar perturbations. We obtain the ...

We study nonlinear gravitational perturbations of vacuum Einstein equations, with Λ<0 in (n+2) dimensions, with n>2, generalizing previous studies for n = 2. We follow the formalism by Ishibashi, Kodama, and Seto to decompose ...

In this paper, we discuss the quantization of an interesting model of Carlip that appeared recently. It shows a way to associate boundary degrees of freedom with the stretched horizon of a stationary nonextremal black hole, ...