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arXiv 1806.08348math.DGgr-qc
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Bartnik边界条件的光滑化和Bartnik准局部质量的其他结果

Smoothing the Bartnik boundary conditions and other results on Bartnik's quasi-local mass

Jeffrey L. Jauregui

摘要:

在文献中出现了相当多的不同版本的巴特尼克的准局部质量的定义,这是不是一个先验清楚,他们中的任何产生相同的价值一般。在本文中,我们取得了进展,协调这些定义。差异的来源有两个方面:边界条件的选择(有三个变体)和非简并或“无视界”条件(至少六个变体)。为了解决边界条件,我们表明,给定一个非负数量曲率的三维区域$Ω$,($R \geq 0$)以Lipschitz方式在$\partial Ω$上扩展到具有$R \geq 0$的渐近平坦3-流形(也沿着$\partial Ω$分布地保持),存在$C^0$范数中任意小的平滑,使得保持$R \geq 0$和$Ω$的几何形状,ADM的质量变化很小。由此我们可以证明,对于两个合理的非简并条件,三个边界条件产生等效的Bartnik质量。我们还讨论了各种非简并条件的微妙之处,并产生一个非平凡的不等式之间的无视界版本的Bartnik质量和布雷的替代这与向外最小化的条件。

英文摘要:

Quite a number of distinct versions of Bartnik's definition of quasi-local mass appear in the literature, and it is not a priori clear that any of them produce the same value in general. In this paper we make progress on reconciling these definitions. The source of discrepancies is two-fold: the choice of boundary conditions (of which there are three variants) and the non-degeneracy or "no-horizon" condition (at least six variants). To address the boundary conditions, we show that given a 3-dimensional region $Ω$ of nonnegative scalar curvature ($R \geq 0$) extended in a Lipschitz fashion across $\partial Ω$ to an asymptotically flat 3-manifold with $R \geq 0$ (also holding distributionally along $\partial Ω$), there exists a smoothing, arbitrarily small in $C^0$ norm, such that $R \geq 0$ and the geometry of $Ω$ are preserved, and the ADM mass changes only by a small amount. With this we are able to show that the three boundary conditions yield equivalent Bartnik masses for two reasonable non-degeneracy conditions. We also discuss subtleties pertaining to the various non-degeneracy conditions and produce a nontrivial inequality between a no-horizon version of the Bartnik mass and Bray's replacement of this with the outward-minimizing condition.

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