Luminal Scalar-Tensor theories for a not so dark Dark Energy

Autor:	Mironov, S., Shtennikova, A., Valencia-Villegas, M.
Rok vydání:	2024
Předmět:	High Energy Physics - Theory Astrophysics - Cosmology and Nongalactic Astrophysics General Relativity and Quantum Cosmology
Druh dokumentu:	Working Paper
Popis:	In general the speed of Gravitational Waves (GWs) in Scalar-Tensor modifications of Einstein's gravity is different from the speed of Light. Nevertheless, it has been measured that their speeds are nearly the same. For the most general Scalar-Tensor theories classified to date that do propagate a graviton -- DHOST, including Horndeski and Beyond Horndeski (BH) theories -- we show that, remarkably, up to 5 self-consistent couplings of the scalar of Dark Energy (DE) to the Photon are enough to make their GWs luminal in a wide set of cases. There is at least a Luminal BH theory for which the GW decay into DE is suppressed in any cosmological background. Comment: 6 pages
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2412.13460 Zobrazit plný text záznamu View this record from Arxiv