491 citations · 6.8k across the 96 of their papers we have counts for
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Caustic formation in DBI models: Wave propagation on planar domain walls
E. Babichev, B. Gafarov, S. Ramazanov +1
We investigate propagation of generic waves on thin planar domain walls effectively described by the scalar Dirac-Born-Infeld model (DBI). We pay a particular attention to the poss…
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…
Invertibility conditions for field transformations with derivatives: toward extensions of disformal transformation with higher derivatives
Eugeny Babichev, Keisuke Izumi, Norihiro Tanahashi +1
We discuss a field transformation from fields to other fields that involves derivatives, , and derive conditions for th…
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…
Invertible field transformations with derivatives: necessary and sufficient conditions
Eugeny Babichev, Keisuke Izumi, Norihiro Tanahashi +1
We formulate explicitly the necessary and sufficient conditions for the local invertibility of a field transformation involving derivative terms. Our approach is to apply the metho…