Speaker
Mauricio Valencia-Villegas
(Lomonosov Moscow State U)
Description
The near luminality and non-decay of Gravitational Waves (GWs) has ruled out all quartic and quintic Beyond Horndeski theories with a minimally coupled photon. In this talk, I show that --- with specific couplings between the scalar and the photon --- one can ensure luminal GWs and their suppressed decay in at least one viable Beyond Horndeski theory. I also discuss extensions of these scalar-photon couplings to general DHOST (Based on 2405.02281, 2412.13460)
