Gravitational Tunneling in Lorentz Violating Gravity

Abstract

Black holes in Lorentz violating gravity, such as Einstein--Aether or Horava--Lifshitz Gravity, are drastically different from their general relativistic siblings. Although they allow for superluminal motion in their vicinity, they still exhibit an absolute causal boundary in the form of a universal horizon. By working in the tunneling picture for a gravitating scalar field, we show that universal horizons emit Hawking radiation in a manner akin to standard results in General Relativity, with a temperature controlled by the high-energy behavior of the dispersion relation of the gravitating field, and in agreement with alternative derivations in the literature. Our results substantiate the link between the universal horizon and thermodynamics in Lorentz violating theories.

arXiv comment16 pages, 2 figures, journal version

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Cited by in corpus (5)

• Regular Black Holes and Horizonless Ultra-Compact Objects in Lorentz-Violating Gravity
• Hawking Radiation in Lorentz Violating Gravity: A Tale of Two Horizons
• Kerr Black Hole in Einstein--Æther Gravity
• On the Resilience of Black Hole Evaporation: Gravitational Tunneling through Universal Horizons
• Universal Horizons without Hypersurface Orthogonality