Abstract
The rigidity statement of the positive mass theorem asserts that an asymptotically flat initial data set for the Einstein equations with zero ADM mass, and satisfying the dominant energy condition, must arise from an embedding into Minkowski space. In this paper, we address the question of what happens when the mass is merely small. In particular, we formulate a conjecture for the stability statement associated with the spacetime version of the positive mass theorem, and give examples to show how it is basically sharp if true. This conjecture is then established under the assumption of spherical symmetry in all dimensions. More precisely, it is shown that a sequence of asymptotically flat initial data satisfying the dominant energy condition, without horizons except possibly at an inner boundary, and with ADM masses tending to zero must arise from isometric embeddings into a sequence of static spacetimes converging to Minkowski space in the pointed volume preserving intrinsic flat sense. The difference of second fundamental forms coming from the embeddings and initial data must converge to zero in \(L^p\), \(1\le p<2\). In addition some minor tangential results are also given, including the spacetime version of the Penrose inequality with rigidity statement in all dimensions for spherically symmetric initial data, as well as symmetry inheritance properties for outermost apparent horizons.
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Acknowledgements
The authors would like to thank Dan Lee for helpful conversations, and Walter Simon for comments. Christina Sormani gratefully acknowledges office space in the Simons Center for Geometry and Physics, Stony Brook University at which most of the research for this paper was performed, and also support from a CUNY Fellowship Leave. Edward Bryden would like to thank the CUNY Graduate Center for allowing him to visit in Spring 2019 during which this paper was completed.
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E. Bryden acknowledges the support of NSF Grant DMS-1612049. M. Khuri acknowledges the support of NSF Grant DMS-1708798. C. Sormani acknowledges the support of NSF Grant DMS-1612049.
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Bryden, E., Khuri, M. & Sormani, C. Stability of the Spacetime Positive Mass Theorem in Spherical Symmetry. J Geom Anal 31, 4191–4239 (2021). https://doi.org/10.1007/s12220-020-00431-0
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DOI: https://doi.org/10.1007/s12220-020-00431-0