In metric-affine bumblebee gravity, gravitational waves obey an orientation-dependent dispersion relation with only two tensor modes; timelike backgrounds shift propagation speed while spacelike ones add anisotropic quadrupole corrections plus a third-derivative term, allowing constraints on ξb².
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Modified dispersion from isotropic Lorentz-violating operators in the gravitational SME produces birefringence and polarization mixing in gravitational waves, with explicit waveforms for binary black holes and new bounds on the coefficients from GW170817 and GWTC-3 data.
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Gravitational waves in metric-affine bumblebee gravity
In metric-affine bumblebee gravity, gravitational waves obey an orientation-dependent dispersion relation with only two tensor modes; timelike backgrounds shift propagation speed while spacelike ones add anisotropic quadrupole corrections plus a third-derivative term, allowing constraints on ξb².
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Propagation effects of Lorentz violation in gravitational waves
Modified dispersion from isotropic Lorentz-violating operators in the gravitational SME produces birefringence and polarization mixing in gravitational waves, with explicit waveforms for binary black holes and new bounds on the coefficients from GW170817 and GWTC-3 data.