Phantom Accretion by Black Holes and the Generalized Second Law of Thermodynamics

Abstract

The accretion of a phantom fluid with non-zero chemical potential by black holes is discussed with basis on the Generalized Second Law of thermodynamics. For phantom fluids with positive temperature and negative chemical potential we demonstrate that the accretion process is possible, and that the condition guaranteeing the positiveness of the phantom fluid entropy coincides with the one required by Generalized Second Law. In particular, this result provides a complementary confirmation that cosmological phantom fluids do not need to have negative temperatures.

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• Thermodynamics of a Schwarzschild Black Hole in Phantom Cosmology with Entropy Corrections
• Thermodynamics of phantom energy in the presence of a Reissner-Nordstrom black hole
• Perturbations of the Vaidya metric in the frequency domain: Quasi-normal modes and tidal response
• First-order correction of tunneling and entropy in the Horndeski gravity-like hairy black hole
• Entropy of cosmological black holes and generalized second law in phantom energy-dominated universe
• Consistency of the mass variation formula for black holes accreting cosmological fluids
• Evolving black hole horizons in General Relativity and alternative gravity