Horndeski gravity was highly constrained from the recent gravitational wave observations by the LIGO Collaboration down to ∣cg/c−1∣≳10−15. In this Letter we study the tensorial perturbations in a flat cosmological background for an analogue version of Horndenki gravity which is based in Teleparallel Gravity constructed from a flat manifold with a nonvanishing torsion tensor. It is found that in this approach, one can construct a more general Horndeski theory satisfying cT=cg/c=1 without eliminating the coupling functions G5(ϕ,X) and G4(ϕ,X) that were highly constrained in standard Horndeski theory. Hence, in the Teleparallel approach one is able to restore these terms, creating an interesting way to revive Horndeski gravity.
@article{arxiv.1907.10057,
title = {Reviving Horndeski Theory using Teleparallel Gravity after GW170817},
author = {Sebastian Bahamonde and Konstantinos F. Dialektopoulos and Viktor Gakis and Jackson Levi Said},
journal= {arXiv preprint arXiv:1907.10057},
year = {2020}
}