
Let \(N\) be a 5-dimensional Lorentzian manifold, which satisfies the Einstein equations with an energy-momentum tensor \(T_{\alpha\beta}\). A spacelike hypersurface \(M\) of \(N\) is called asymptotically flat of order \(\tau\) if there is a compact set \(K\subset M\) such that \(M - K\) is the disjoint union of a finite number of subsets \(M_1,\dots,M_k\) (called the ``ends'' of \(M\)) each diffeomorphic to the complement of a contractible compact set in \(\mathbb{R}^4\). Under the diffeomorphism the metric of \(M_l\subset M\) is of the form \(g_{ij} =\delta_{ij} + a_{ij}\) in the standard coordinates \(\{x^i\}\) on \(\mathbb{R}^4\), where \(a_{ij}\) satisfies \(a_{ij} = O(r^{-\tau})\), \(\partial_ka_{ij} = O(r^{-\tau-1})\), \(\partial_l\partial_k a_{ij} = O(r^{-\tau-2})\). As usual the total energy \(E_l\), the total linear momentum \(p_{lk}\), and the total electromagnetic momentum \(q_{lij}\) of end \(M_l\) are defined. The Positive Mass Theorem due to R. Schoen, S. T. Yau, and E. Witten has been extended by the author [J. Math. Phys. 40, 3540-3552 (1999; Zbl 0952.83010)] to spin spacelike hypersurface in \(N\). In the present paper a further extension is given. Let \(M\subset N\) be a spacelike asymptotically flat hypersurface of order \(\tau >1\). Let \(L\) be the \(\text{Spin}^c\) structure of complex Witten-Dirac spinor bundle of \(M\) with \(U(1)\) connection \(A\), which is also asymptotically flat of order \(\tau >1\). If \(M\) satisfies a certain charged dominant energy condition, then, for each end \(M_l\) there holds an inequality for \(E_l\), involving \(p_{lk}\) and \(q_{lij}\). An analogous result is obtained for a 4-dimensional Lorentzian manifold, which satisfies the Einstein equations.
Einstein equations, Global differential geometry of Lorentz manifolds, manifolds with indefinite metrics, Special Riemannian manifolds (Einstein, Sasakian, etc.), energy-momentum tensor, positive mass theorem, Lorentzian manifold, asymptotically flat, spacelike hypersurface, Applications of global differential geometry to the sciences
Einstein equations, Global differential geometry of Lorentz manifolds, manifolds with indefinite metrics, Special Riemannian manifolds (Einstein, Sasakian, etc.), energy-momentum tensor, positive mass theorem, Lorentzian manifold, asymptotically flat, spacelike hypersurface, Applications of global differential geometry to the sciences
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