2017/12/31 by Eugeny Babichev, Christos Charmousis, Gilles Esposito-Farèse +2 · 2 citations
Physics and Astronomy · #Black Holes and Theoretical Physics #Black hole (networking) #Classical mechanics #Cosmological constant #Cosmology #Cosmology and Gravitation Theories #Dark energy #De Sitter universe #Event (particle physics) #Event horizon #Gravitation #Gravitational wave #Observable #Physics #Pulsars and Gravitational Waves Research #Quantum mechanics #Scalar field #Theoretical physics #Universe #astro-ph.CO #gr-qc
paper · pdf · doi:10.1103/physrevlett.120.241101
published as Phys. Rev. Lett. 120, 241101 (2018) · 5 pages, no figure, RevTeX4 format; v2: correction of a sign mistake in Eq. (2), coming from Eq. (11) of Ref. [3], and of its numerical consequences, although our overall conclusions remain the same; and minor changes reflecting the version to appear in Phys. Rev. Lett
arxiv created 2018/05/28 · openalex publication_date 2018/06/12 · arxiv updated 2018/06/20 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05
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 example of an exact Schwarzschild-de Sitter solution of a specific beyond-Horndeski theory, that imposing the strict equality of these speeds in the asymptotic homogeneous Universe suffices to guarantee so even in the vicinity of the black hole, where large curvature and scalar-field gradients are present. We also find that the solution is stable in a range of the model parameters. We finally show that an infinite class of beyond-Horndeski models satisfying the equality of gravity and light speeds still provides an elegant self-tuning: the very large bare cosmological constant entering the Lagrangian is almost perfectly counterbalanced by the energy-momentum tensor of the scalar field, yielding a tiny observable effective cosmological constant.