An improved derivation of the Smarr Formula for Lorentz-breaking gravity
arXiv:1701.04992 · doi:10.1103/PhysRevD.95.124010
Abstract
Thermodynamical properties of black holes in gravitational theories without Local Lorentz invariance have been subject to intense investigation in the past years due to the presence of universal horizons, which are strong causal barriers even for superluminal signals. Here we present a novel general method for deriving the Smarr formula for this class of theories: in particular we show that the Smarr formulae for Einstein-Aether theory and infrared Horava gravity follow from scale invariance. We not only reproduce straightforwardly previous findings for static black hole solutions, but we are also able to generalise them to the case of stationary rotating black holes. Finally, we apply our results to the rotating black holes with universal horizon as found in three dimensions, from which we shall draw some lessons on the viability of black hole thermodynamics for black hole solutions endowed with universal horizons.
arXiv comment12 pages; v2: typos corrected, references added and updated, discussion improved; v3: minor typos corrected in Eqs (5) & (6)
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