491 citations · 6.8k across the 96 of their papers we have counts for
96 papers
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…
Properties of general stationary axisymmetric spacetimes: circularity and beyond
Eugeny Babichev, Jacopo Mazza
We analyse properties of general stationary and axisymmetric spacetimes, with a particular focus on circularity -- an accidental symmetry enjoyed by the Kerr metric, and therefore…
Large black-hole scalar charges induced by cosmology in Horndeski theories
Eugeny Babichev, Gilles Esposito-Farèse, Ignacy Sawicki +1
The regularity of black hole solutions, embedded in an expanding Universe, is studied in a subclass of Horndeski theories, namely the sum of the simplest quadratic, cubic and quint…
Cherenkov radiation as ghost instability
Eugeny Babichev
We demonstrate that Cherenkov radiation can be interpreted as ghost instability of a certain type. Solutions of modified gravity theories often contain ghost instabilities. One typ…
Horndeski speed tests with scalar-photon couplings
Eugeny Babichev, Christos Charmousis, Benjamin Muntz +2
We revisit multi-messenger constraints from neutron star mergers on the speed of propagation of gravitational and electromagnetic waves in Horndeski and beyond Horndeski theories.…
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…