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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…
NANOGrav spectral index from melting domain walls
E. Babichev, D. Gorbunov, S. Ramazanov +2
We discuss cosmic domain walls described by a tension red-shifting with the expansion of the Universe. These melting domain walls emit gravitational waves with the low-frequency sp…
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…