53 citations · 148 across the 10 of their papers we have counts for
10 papers
Global conformal symmetry in scalar-tensor theories
Eugeny Babichev, Christos Charmousis, Mokhtar Hassaine +1
We study a subclass of Horndeski gravity which has both global conformal and shift symmetries. Global symmetries are characterised by the presence of a conserved current which has…
Exact black hole solutions in scalar-tensor theories
Nicolas Lecoeur
General Relativity allows for a unique black hole solution, characterized by its mass M, angular momentum J, and electric charge Q. Black holes in General Relativity are thus said…
Black holes with primary scalar hair
Athanasios Bakopoulos, Christos Charmousis, Panagiota Kanti +2
We present explicit black holes endowed with primary scalar hair within the shift-symmetric subclass of Beyond Horndeski theories. These solutions depend, in addition to the conven…
Exact black hole solutions in higher-order scalar-tensor theories
Eugeny Babichev, Christos Charmousis, Nicolas Lecoeur
In this chapter, we discuss explicit black hole solutions in higher-order scalar-tensor theories. After a brief recap of no-hair theorems, we start our discussion by so-called stea…
Rotating black holes embedded in a cosmological background for scalar-tensor theories
Eugeny Babichev, Christos Charmousis, Nicolas Lecoeur
We present solutions of DHOST theories describing a rotating black hole embedded in an expanding universe. The solution is constructed by conformal transformation of a stealth Kerr…
Selecting Horndeski theories without apparent symmetries and their black hole solutions
Eugeny Babichev, Christos Charmousis, Mokhtar Hassaine +1
Starting from a generalised Kaluza-Klein action including arbitrary Horndeski potentials, we establish integrability and compatibility conditions that solve the generic field equat…
Conformally coupled scalar in Lovelock theory
Eugeny Babichev, Christos Charmousis, Mokhtar Hassaine +1
In arbitrary higher dimension, we consider the combination of Lovelock gravity alongside a scalar-tensor action built out of higher order operators and Euler densities. The latter…
Compact objects in gravity theories
Athanasios Bakopoulos, Christos Charmousis, Nicolas Lecoeur
We briefly discuss explicit compact object solutions in higher-order scalar-tensor theories. We start by so-called stealth solutions, whose metric are General Relativity (GR) solut…
Conformally coupled theories and their deformed compact objects: from black holes, radiating spacetimes to eternal wormholes
Eugeny Babichev, Christos Charmousis, Mokhtar Hassaine +1
We study a higher order conformally coupled scalar tensor theory endowed with a covariant geometric constraint relating the scalar curvature with the Gauss-Bonnet scalar. It is a p…
Compact objects of spherical symmetry in beyond Horndeski theories
Athanasios Bakopoulos, Christos Charmousis, Panagiota Kanti +1
We analyse in all generality beyond Horndeski theories of shift symmetry in a static and spherically symmetric spacetime. By introducing four auxiliary functions, we write the fiel…