Model-independent test of the parity symmetry of gravity with gravitational waves

Understand

Gravitational wave (GW) data can be used to test the parity symmetry of gravity by investigating the difference between left-hand and right-hand circular polarization modes.

• In this article, we develop a method to decompose the circular polarizations of GWs produced during the inspiralling stage of compact binaries, with the help of stationary phase approximation.
• The foremost advantage is that this method is simple, clean, independent of GW waveform, and is applicable to the existing detector network.
• Applying it to the mock data, we test the parity symmetry of gravity by constraining the velocity birefringence of GWs.