Extremal Cosmological Black Holes in Horndeski Gravity and the Anti-Evaporation Regime

2020/04/30 by Ismael Ayuso, Diego Sáez-Chillón Gómez
Physics and Astronomy · #Black Holes and Theoretical Physics #Black hole (networking) #Cosmological constant #Cosmology and Gravitation Theories #De Sitter universe #Horizon #Lagrangian #Metric (unit) #Noncommutative and Quantum Gravity Theories #RADIUS #de Sitter–Schwarzschild metric #gr-qc #hep-th

paper · pdf · doi:10.3390/universe6110210

published as Universe 2020, 6(11), 210 · 15 pages, version published

openalex created_date 2020/05/01 · arxiv created 2020/11/17 · openalex publication_date 2020/11/17 · arxiv updated 2020/11/19 · openalex updated_date 2026/08/05

Abstract

Extremal cosmological black holes are analysed in the framework of the most general second order scalar-tensor theory, the so-called Horndeski gravity. Such extremal black holes are a particular case of Schwarzschild-De 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 so-called anti-evaporation 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.

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