Gravitational wave propagation beyond general relativity: waveform distortions and echoes

  title={Gravitational wave propagation beyond general relativity: waveform distortions and echoes},
  author={Jose Mar{\'i}a Ezquiaga and Wayne Hu and Macarena Lagos and Meng-Xiang Lin},
  journal={Journal of Cosmology and Astroparticle Physics},
We study the cosmological propagation of gravitational waves (GWs) beyond general relativity (GR) across homogeneous and isotropic backgrounds. We consider scenarios in which GWs interact with an additional tensor field and use a parametrized phenomenological approach that generically describes their coupled equations of motion. We analyze four distinct classes of derivative and non-derivative interactions: mass, friction, velocity, and chiral. We apply the WKB formalism to account for the… 
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