A class of scalar-tensor dark energy theories with photon couplings can have luminal gravitational waves and suppressed gravitational wave decay into dark energy.
We find that only two types of DE–Photon couplings are necessary
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Luminal Scalar-Tensor theories for a not so dark Dark Energy
A class of scalar-tensor dark energy theories with photon couplings can have luminal gravitational waves and suppressed gravitational wave decay into dark energy.