155 citations · 330 across the 10 of their papers we have counts for
10 papers
The fate of observers in circular motion
Antoine Lehébel, Vitor Cardoso
In Newtonian physics or in general relativity, energy dissipation causes observers moving along circular orbits to slowly spiral towards the source of the gravitational field. We s…
Quadratic curvature corrections to stringy effective actions and the absence of de Sitter vacua
Francesc Cunillera, William T. Emond, Antoine Lehébel +1
We investigate the combined effect of fluxes and higher-order curvature corrections, in the form of the Gauss-Bonnet term, on the existence of de Sitter vacua in a heterotic string…
Neutron star scalarization with Gauss-Bonnet and Ricci scalar couplings
Giulia Ventagli, Georgios Antoniou, Antoine Lehébel +1
Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Farèse model, in which a scalar field couples to the Ricci scalar or, equivalentl…
Black hole scalarization with Gauss-Bonnet and Ricci scalar couplings
Georgios Antoniou, Antoine Lehébel, Giulia Ventagli +1
Spontaneous scalarization is a gravitational phenomenon in which deviations from general relativity arise once a certain threshold in curvature is exceeded, while being entirely ab…
The onset of spontaneous scalarization in generalised scalar-tensor theories
Giulia Ventagli, Antoine Lehébel, Thomas P. Sotiriou
In gravity theories that exhibit spontaneous scalarization, astrophysical objects are identical to their general relativistic counterpart until they reach a certain threshold in co…
Black holes in self-tuning cubic Horndeski cosmology
William T. Emond, Antoine Lehébel, Paul M. Saffin
Observations of neutron star mergers in the late Universe have given significant restrictions to the class of viable scalar-tensor theories. In this paper we construct black holes…
A natural theory of dark energy
Lorenzo Bordin, Francesc Cunillera, Antoine Lehébel +1
We propose a mechanism that generates a naturally light dark energy field (with Hubble scale mass), starting from a theory with exclusively high scale (Planckian) couplings. It is…
Compact astrophysical objects in modified gravity
Antoine Lehébel
Twenty years have passed since the discovery of the accelerated expansion of the Universe, reviving the interest for alternative theories of gravity. Adding a scalar degree of free…
Black holes and stars in Horndeski theory
Eugeny Babichev, Christos Charmousis, Antoine Lehébel
We review black hole and star solutions for Horndeski theory. For non-shift symmetric theories, black holes involve a Kaluza-Klein reduction of higher dimensional Lovelock solution…
Stability of rings around a triaxial primary
Antoine Lehébel, Matthew S. Tiscareno
Generally, the oblateness of a planet or moon is what causes rings to settle into its equatorial plane. However, the recent suggestion that a ring system might exist (or have exist…