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**Video URL**
http://pirsa.org/21120026

## Abstract

I study the dynamics of a gyroscope far from an isolated source of gravitational waves. With respect to a local frame 'tied to the distant stars', the gyroscope precesses when gravitational waves cross its path, resulting in a net `orientation memory', carrying information on the gravitational wave profile. I show that the precession rate is given by the so-called "dual covariant mass aspect", providing a celestially local measurement protocol for this quantity. Moreover, I show that the net memory effect can be derived from the flux-balance equations for superrotation charges in the "generalized BMS" algebra. Finally, I show how the spin memory effect à la Pasterski et al. is reproduced as a special case.

## Details

**Talk Number**21120026

**Speaker Profile**Ali Seraj

**Collection**Quantum Gravity

- Quantum Gravity

**Scientific Area**

- Scientific Series

**Talk Type**

**Source Repository**PIRSA