Search for the birefringence of gravitational waves with the third observing run of Advanced LIGO-Virgo

Understand

Gravitational waves would attain birefringence during their propagation from distant sources to the Earth, when the CPT symmetry is broken.

• If it was sizeable enough, such birefringence could be measured by the Advanced LIGO, Virgo and KAGRA detector network.
• In this work, we place constraints on the birefringence of gravitational waves with the third observing run of this network, i.e.
• two catalogues GWTC-2 and GWTC-3.