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Extremal cosmological black holes in Horndeski gravity and the anti-evaporation regime Ayuso, Ismael Saez Gómez, Diego Gravitation Physics Classical and Quantum Gravitation, Relativity Theory Cosmology Black holes (Astronomy) 2101 Cosmología y Cosmogonía Producción Científica 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. European Union’s Horizon 2020 (European Cooperation in Science and Technology) (action CA15117) Fundação para a Ciència e a Tecnologia (FCT) (grant number PD/BD/114435/2016) 2023-03-01T08:51:04Z 2023-03-01T08:51:04Z 2020 info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion Universe, 2020, Vol. 6, Nº.11, 210 2218-1997 https://uvadoc.uva.es/handle/10324/58800 10.3390/universe6110210 210 11 Universe 6 2218-1997 eng https://www.mdpi.com/2218-1997/6/11/210 info:eu-repo/grantAgreement/EC/H2020/15117 Atribución 4.0 Internacional info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ © 2020 The Authors application/pdf MDPI https://uvadoc.uva.es/bitstream/10324/58800/4/Extremal-Cosmological-Black-Holes-in-Horndeski.pdf.jpg Hispana TEXT http://creativecommons.org/licenses/by/4.0/ UVaDOC. Repositorio Documental de la Universidad de Valladolid https://uvadoc.uva.es/handle/10324/58800