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• W2028014019 abstract "In the 3+1 framework of the Einstein equations for the case of a vanishing shift vector and arbitrary lapse, we calculate explicitly the four boundary equations arising from the vanishing of the projection of the Einstein tensor along the normal to the boundary surface of the initial-boundary value problem. Such conditions take the form of evolution equations along (as opposed to across) the boundary for certain components of the extrinsic curvature and for certain space derivatives of the three-metric. We argue that, in general, such boundary conditions do not follow necessarily from the evolution equations and the initial data, but need to be imposed on the boundary values of the fundamental variables. Using the Einstein-Christoffel formulation, which is strongly hyperbolic, we show how three of the boundary equations up to linear combinations should be used to prescribe the values of some incoming characteristic fields. Additionally, we show that the fourth one imposes conditions on some outgoing fields." @default.
• W2028014019 created "2016-06-24" @default.
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• W2028014019 date "2003-08-14" @default.
• W2028014019 modified "2023-09-25" @default.
• W2028014019 title "Einstein boundary conditions for the 3+1 Einstein equations" @default.
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• W2028014019 doi "https://doi.org/10.1103/physrevd.68.044014" @default.
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