PIRSA:21120026

Video URL

https://pirsa.org/21120026

Gyroscope memory: detecting gravitational wave memory effects with a gyroscope

Seraj, A. (2021). Gyroscope memory: detecting gravitational wave memory effects with a gyroscope. Perimeter Institute for Theoretical Physics. https://pirsa.org/21120026

Seraj, Ali. Gyroscope memory: detecting gravitational wave memory effects with a gyroscope. Perimeter Institute for Theoretical Physics, Dec. 09, 2021, https://pirsa.org/21120026 

          @misc{ scivideos_PIRSA:21120026,
            doi = {10.48660/21120026},
            url = {https://pirsa.org/21120026},
            author = {Seraj, Ali},
            keywords = {Quantum Gravity},
            language = {en},
            title = {Gyroscope memory: detecting gravitational wave memory effects with a gyroscope},
            publisher = {Perimeter Institute for Theoretical Physics},
            year = {2021},
            month = {dec},
            note = {PIRSA:21120026 see, \url{https://scivideos.org/pirsa/21120026}}
          }

Ali Seraj Université Libre de Bruxelles

Talk numberPIRSA:21120026
DOI10.48660/21120026
Source RepositoryPIRSA
Collection
Talk Type Scientific Series
Subject

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.