Ali Seraj (Brussels U.), Gyroscopic Gravitational Memory

Wednesday 16 Mar 2022, 11:00 → 12:00 Europe/Stockholm

Albano 3: 6228 - Mega (22 seats) (Albano Building 3)

Title: Gyroscopic Gravitational Memory

Abstract: In this talk, I show that gravitational waves cause freely falling gyroscopes to precess relative to fixed distant stars. The precession rate decays as the square of the inverse distance to the source, and is proportional to a suitable Noether current for dual asymptotic symmetries at null infinity. Integrating the rate over time yields a net rotation, dubbed as `gyroscopic memory', which encodes low frequency effects in gravitational waves. The gyroscopic memory reproduces the known spin memory effect but also contains an extra contribution due to the generator of gravitational electric-magnetic duality.