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2023

Gravitational wave polarizations with different propagation speeds

Schumacher, Kristen, Yunes, Nicolas, Yagi, Kent

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In some modified theories of gravity, gravitational waves can contain up to six different polarizations, which can travel at speeds different from that of light.

Searches for these different polarizations in gravitational wave data are important because any detection would be clear evidence of new physics, while clear non-detections could constrain some modified theories.
The first step toward searching the data for such gravitational wave content is the calculation of the amplitudes of these different polarizations.
Here we present a model-independent method to obtain the different polarizations of gravitational waves directly from the metric perturbation in theories where these polarizations are allowed to travel at different speeds.

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