Luminal Scalar-Tensor theories for a not so dark Dark Energy
arXiv:2412.13460 · doi:10.1103/PhysRevD.111.L101501
Abstract
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, {\it 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. We find at least one Luminal Beyond Horndeski theory for which the GW decay into Dark Energy is suppressed in any cosmological background.
arXiv comment5 pages. Matches the version in PRD. Results unchanged. Expanded discussions in the final section
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