Zobrazeno 1 - 10
of 214
pro vyhledávání: '"Lehebel, A"'
Autor:
Lehébel, Antoine, Cardoso, Vitor
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 show that the loss of energy has the same effect in any theory of gravi
Externí odkaz:
http://arxiv.org/abs/2202.08850
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 inspired framework, compactified on spheres and tori. We first gain s
Externí odkaz:
http://arxiv.org/abs/2112.05771
Publikováno v:
Phys. Rev. D 104, 124078 (2021)
Spontaneous scalarization of neutron stars has been extensively studied in the Damour and Esposito-Far\`ese model, in which a scalar field couples to the Ricci scalar or, equivalently, to the trace of the energy-momentum tensor. However, scalarizatio
Externí odkaz:
http://arxiv.org/abs/2111.03644
We study the properties of compact objects in a particular 4D Horndeski theory originating from higher dimensional Einstein-Gauss-Bonnet gravity. Remarkably, an exact vacuum solution is known. This compact object differs from general relativity mostl
Externí odkaz:
http://arxiv.org/abs/2109.01149
Publikováno v:
Phys. Rev. D 104, 044002 (2021)
Spontaneous scalarization is a gravitational phenomenon in which deviations from general relativity arise once a certain threshold in curvature is exceeded, while being entirely absent below that threshold. For black holes, scalarization is known to
Externí odkaz:
http://arxiv.org/abs/2105.04479
Publikováno v:
Phys. Rev. D 102, 024050 (2020)
In gravity theories that exhibit spontaneous scalarization, astrophysical objects are identical to their general relativistic counterpart until they reach a certain threshold in compactness or curvature. Beyond this threshold, they acquire a non-triv
Externí odkaz:
http://arxiv.org/abs/2006.01153
Publikováno v:
Phys. Rev. D 101, 084008 (2020)
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 within the "self-tuning" class of this restricted set, whereby the bar
Externí odkaz:
http://arxiv.org/abs/1912.09199
Publikováno v:
Phys. Rev. D 101, 085012 (2020)
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 derived from the clockwork model, with ${\cal O}(100)$ scalar fields i
Externí odkaz:
http://arxiv.org/abs/1912.04905
Autor:
Lehebel, Antoine
Vingt années se sont écoulées depuis la découverte de l'expansion accélérée de l'Univers, ravivant l'intérêt pour les théories alternatives de la gravité. Ajouter un champ scalaire à la métrique habituelle de la relativité générale es
Externí odkaz:
http://www.theses.fr/2018SACLS204/document
Autor:
Gavaud, S., Haurogné, K., Buchet, A., Garcia Vinado, I., Allard, M., Lehébel, A., Leblanc-Maridor, M., Bach, J.M., Belloc, C., Lieubeau, B., Hervé, J.
Publikováno v:
In animal June 2023 17(6)
