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2022-03-10 - Colloque/Présentation - communication orale - Anglais - 30 page(s)

Ducobu Ludovic , "Scalarized black holes in Horndeski gravity : an overview" in The 1st International Conference of Holography and its Applications, Damghan, Iran, 2022

  • Codes CREF : Physique théorique et mathématique (DI1210), Gravitation (DI1216)
  • Unités de recherche UMONS : Physique théorique et mathématique (S814)
  • Instituts UMONS : Institut de Recherche sur les Systèmes Complexes (Complexys)
  • Centres UMONS : Algèbre, Géométrie et Interactions fondamentales (AGIF)
Texte intégral :

Abstract(s) :

(Anglais) General Relativity [GR] offers an extremely successful framework to describe the gravitational interaction whose achievements range from the solar system to the cosmological scale. Nonetheless, despite those undeniable success, the necessity to question the framework of GR is clear at both the experimental and theoretical level. On the one hand, the lack of explanation for the origin and composition of dark matter and dark energy reveal the necessity to extent GR on an experimental basis. On the other hand, the interpretation of spacetime singularities and the elusiveness of a consistent UV completion of the theory motivates a "reworking" of GR from a purely theoretical point of view. Since not all of the aforementioned puzzles can be purely reduced to quantum correction problems, this motivates the study of alternative theories of gravitation already at the classical level. Among the many possible directions one can follow, a very interesting one consist in the addition of new degrees of freedom in the theory (in addition to the spacetime metric) and, in this respect, the simplest candidate is a scalar field. We then obtain the framework of a scalar-tensor theory of gravity. In this talk, I will review the main features of Horndeski gravity and comment on black hole (BH) solutions known in this generic class of scalar-tensor theories of gravity. This journey will give us the opportunity to glimpse at the famous no-hair arguments limiting the possibility to endow BH with non-trivial scalar fields, to comment on the construction of Horndeski gravity and to review several interesting BH solutions known in scalar-tensor theories with coupling to the Gauss-Bonnet invariant or with derivative coupling to the Einstein-tensor. This talk, although self-contained, will be part of a three-part work with Sebastian Bahamonde and Christian Pfeifer aiming to present recent results obtained for scalarized black holes in scalar-torsion gravity, an alternative way to couple scalar fields to gravity.