MG12 - Talk detail
 

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 Participant 

Institution

Session

Talk

Abstract

Black Holes Thermodynamics and Nontrivial Vacua

Backgrounds which break Lorentz-symmetry are especially interesting in the context of derivatively coupled field theories. Namely, in these theories perturbations around such a background propagate with a front velocity different from the speed of light. Thus one could expect that horizons and, consequently, thermodynamical properties of black holes surrounded by such backgrounds are different from the usual case. In the talk I will consider a particular explicit example of such a system and show that spontaneous Lorentz-symmetry breaking generically does not violate the generalized second law of thermodynamics, contrary to recent claims.

A stable road to Superacceleration

In this talk I will discuss a new broad class of scalar-field theories which are minimally coupled to gravity and yet can violate the Null Energy Condition (NEC). The main interesting feature of these theories is that the violation of NEC can occur in a manifestly stable fashion. Namely, the perturbations around the NEC-violating configurations have positive definite kinetic energies and a positive speed of sound.

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