Title: Definition of spin in the presence of gravity

Presenter: Seyed Faroogh Moosavian (University of Oxford)

Time & Date: Wednesday, November 13th, 2024 (Aban 23rd, 1403), 12:00 IRST

Participation Link: https://meet.google.com/rzp-vtxh-dbf

Abstract: Defining a notion of spin in the presence of gravity is a long-standing question in the field of gravitational physics. In this talk, I will propose a definition of spin for asymptotically flat spacetimes based on the notion of asymptotic symmetries. I will argue that the right asymptotic symmetries to approach this problem is the generalized BMS algebra. The construction relies on the method of coadjoint orbit which allows the construction of moment map for the action of generalized BMS algebra on a gravitational phase space. I then apply the construction to the case of the Kerr black hole and explain how its mass and angular momentum can be computed in terms of Casimir functionals associated with the coadjoint orbits of generalized BMS algebra.

 

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