Sourya Ray

Enthalpy and the Mechanics of AdS Black Holes

We present geometric derivations of the Smarr formula for static AdS black holes and an expanded first law that includes variations in the cosmological constant. These two results are further related by a scaling argument based on Eulers theorem. The key new ingredient in the constructions is a two-form potential for the static Killing field. Surface integrals of the Killing potential determine the coefficient of the variation of Λ in the first law. This coefficient is proportional to a finite, effective volume for the region outside the AdS black hole horizon, which can also be interpreted as minus the volume excluded from a spatial slice by the black hole horizon. This effective volume also contributes to the Smarr formula. Since Λ is naturally thought of as a pressure, the new term in the first law has the form of effective volume times change in pressure that arises in the variation of the enthalpy in classical thermodynamics. This and related arguments suggest that the mass of an AdS black hole should be interpreted as the enthalpy of the spacetime.

Hairy black holes sourced by a conformally coupled scalar field in D dimensions

Fil: Giribet, Gaston Enrique. Pontificia Universidad Catolica de Valparaiso; Chile. Consejo Nacional de Investigaciones Cientificas y Tecnicas. Oficina de Coordinacion Administrativa Ciudad Universitaria. Instituto de Fisica de Buenos Aires. Universidad de Buenos Aires. Facultad de Ciencias Exactas y Naturales. Instituto de Fisica de Buenos Aires; Argentina

Scalar field perturbations in asymptotically Lifshitz black holes

We consider scalar field perturbations about asymptotically Lifshitz black holes with dynamical exponent

Birkhoff's theorem in higher derivative theories of gravity

z

The Thermodynamics of Kaluza-Klein Black Hole/Bubble Chains

in

Do Killing-Yano tensors form a Lie algebra?

D

Boost mass and the mechanics of accelerated black holes

dimensions. We show that, for suitable boundary conditions, these Lifshitz black holes are stable under scalar field perturbations. For

The first law for boosted Kaluza-Klein black holes

z=2

Mass and Free Energy of Lovelock Black Holes

, we explicitly compute the quasinormal mode frequencies, which result to be purely imaginary, and then obtain the damping-off of the scalar field perturbation in these backgrounds. The general analysis includes, in particular, the

Genuine Cosmic Hair

z=3