491 citations · 6.8k across the 96 of their papers we have counts for
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Disforming the Kerr metric
Timothy Anson, Eugeny Babichev, Christos Charmousis +1
Starting from a recently constructed stealth Kerr solution of higher order scalar tensor theory involving scalar hair, we analytically construct disformal versions of the Kerr spac…
Gravitational reheating and superheavy Dark Matter creation after inflation with non-minimal coupling
E. Babichev, D. Gorbunov, S. Ramazanov +1
We discuss the gravitational creation of superheavy particles in an inflationary scenario with a quartic potential and a non-minimal coupling between the inflaton and the R…
Vainshtein screening for slowly rotating stars
Timothy Anson, Eugeny Babichev
We study the Vainshtein mechanism in the context of slowly rotating stars in scalar-tensor theories. While the Vainshtein screening is well established for spherically symmetric sp…
Gravitational misalignment mechanism of Dark Matter production
Eugeny Babichev, Dmitry Gorbunov, Sabir Ramazanov
We consider Dark Matter composed of an oscillating singlet scalar field. On top of the mass term, the scalar is equipped with a potential spontaneously breaking Z_2-symmetry. This…
Regular black holes via the Kerr-Schild construction in DHOST theories
Eugeny Babichev, Christos Charmousis, Adolfo Cisterna +1
We extend the standard Kerr-Schild solution generating method to higher order scalar tensor theories that are shift-invariant for the scalar field. Certain degeneracy conditions, c…
Emergence of ghosts in Horndeski theory
Eugeny Babichev
We show that starting from initial conditions with stable perturbations, evolution of a galileon scalar field results in the appearance of a ghost later on. To demonstrate this, we…