Date: Thursday, September 26, 2019
Location: 4088 East Hall (4:00 PM to 5:00 PM)
Title: Evaluating Quasilocal Angular Momentum and CenterofMass at Null Infinity
Abstract: We calculate the limits of the quasilocal angular momentum and centerofmass defined by ChenWangYau for a family of spacelike twospheres approaching future null infinity in an asymptotically flat spacetime admitting a BondiSachs expansion. Our result complements earlier work of ChenWangYau, where the authors calculate the quasilocal energy and linear momentum at null infinity. Working in the centerofmass frame, i.e. assuming vanishing of linear momentum at null infinity, we obtain explicit expressions for the angular momentum and centerofmass at future null infinity in terms of the observables appearing in the BondiSachs expansion of the spacetime metric. This is joint work with YeKai Wang and ShingTung Yau.
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Speaker: Jordan Keller
Institution: Harvard, Black Hole Initiative, Cambridge MA
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