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Isometric Embeddings into the Minkowski Space and New Quasi-Local Mass

2008/05/31 by Mu-Tao Wang, Mu‐Tao Wang, Shing-Tung Yau +1 · 155 citations
Mathematics · Medicine · Physics and Astronomy · #Black Holes and Theoretical Physics #Computer science #Cosmology and Gravitation Theories #Geometry #Internal medicine #Isometric exercise #Mathematical analysis #Mathematics #Medicine #Minkowski space #Noncommutative and Quantum Gravity Theories #Physics #Pure mathematics #Space (punctuation) #gr-qc #math-ph #math.DG #math.MP

paper · pdf · doi:10.1007/s00220-009-0745-0

published in Communications in Mathematical Physics 288(3), 919-942 (Springer Science+Business Media) · 33 pages, final version. to appear in Comm. Math. Phys

arxiv created 2008/11/11 · openalex publication_date 2009/02/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

The definition of quasi-local mass for a bounded space-like region in space-time is essential in several major unsettled problems in general relativity. The quasi-local mass is expected to be a type of flux integral on the boundary two-surface and should be independent of whichever space-like region it bounds. An important idea which is related to the Hamiltonian formulation of general relativity is to consider a reference surface in a flat ambient space with the same first fundamental form and derive the quasi-local mass from the difference of the extrinsic geometries. This approach has been taken by Brown-York and Liu-Yau (see also related works) to define such notions using the isometric embedding theorem into the Euclidean three-space. However, there exist surfaces in the Minkowski space whose quasilocal mass is strictly positive. It appears that the momentum information needs to be accounted for to reconcile the difference. In order to fully capture this information, we use isometric embeddings into the Minkowski space as references. In this article, we first prove an existence and uniqueness theorem for such isometric embeddings. We then solve the boundary value problem for Jang's equation as a procedure to recognize such a surface in the Minkowski space. In doing so, we discover new expression of quasi-local mass. The new mass is positive when the ambient space-time satisfies the dominant energy condition and vanishes on surfaces in the Minkowski space. It also has the nice asymptotic behavior at spatial and null infinity. Some of these results were announced in [29].

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