Lorentz and CPT Symmetry Breaking via Dispersion and Birefringence Effects of Gravitational Waves

Possible symmetry-breaking effects during gravitational-wave propagation are investigated using the Standard-Model Extension and the open-source LIGO algorithm library suite. We bridge the gap between the theory of spacetime-symmetry breaking and the analysis of gravitational-waves signals. We analyze directly the LIGO-Virgo-KAGRA interferometers’ strain, bypassing reliance on posterior parameters inferred under a GR model.