1.1k citations · 7.3k across the 38 of their papers we have counts for
38 papers
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…
Hamiltonian vs stability in alternative theories of gravity
Gilles Esposito-Farese
When a Hamiltonian density is bounded by below, we know that the lowest-energy state must be stable. One is often tempted to reverse the theorem and therefore believe that an unbou…
Hamiltonian vs stability and application to Horndeski theory
Eugeny Babichev, Christos Charmousis, Gilles Esposito-Farese +1
A Hamiltonian density bounded from below implies that the lowest-energy state is stable. We point out, contrary to common lore, that an unbounded Hamiltonian density does not neces…
Stability of a black hole and the speed of gravity waves within self-tuning cosmological models
Eugeny Babichev, Christos Charmousis, Gilles Esposito-Farese +1
The gravitational wave event GW170817 together with its electromagnetic counterparts constrains the speed of gravity to be extremely close to that of light. We first show, on the e…
Cosmological self-tuning and local solutions in generalized Horndeski theories
Eugeny Babichev, Gilles Esposito-Farese
We study both the cosmological self-tuning and the local predictions (inside the Solar system) of the most general shift-symmetric beyond Horndeski theory. We first show that the c…
Counting the degrees of freedom of generalized Galileons
Cedric Deffayet, Gilles Esposito-Farese, Daniele A. Steer
We consider Galileon models on curved spacetime, as well as the counterterms introduced to maintain the second-order nature of the field equations of these models when both the met…