Extremal Cosmological Black Holes in Horndeski Gravity and the AntiEvaporation Regime
Abstract
Extremal cosmological black holes are analysed in the framework of the most general second order scalartensor theory, the~socalled Horndeski gravity. Such~extremal black holes are a particular case of SchwarzschildDe Sitter black holes that arises when the black hole horizon and the cosmological one coincide. Such~metric is induced by a particular value of the effective cosmological constant and is known as Nariai spacetime. The~existence of this type of solutions is studied when considering the Horndeski Lagrangian and its stability is analysed, where the socalled antievaporation regime is studied. Contrary to other frameworks, the~radius of the horizon remains stable for some cases of the Horndeski Lagrangian when considering perturbations at linear order.
 Publication:

Universe
 Pub Date:
 November 2020
 DOI:
 10.3390/universe6110210
 arXiv:
 arXiv:2004.10139
 Bibcode:
 2020Univ....6..210A
 Keywords:

 General Relativity and Quantum Cosmology;
 High Energy Physics  Theory
 EPrint:
 15 pages, version published