Surface stress tensor and junction conditions on a rotating null horizon

Surface stress tensor and junction conditions on a rotating null horizon
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旋转零水平面上的表面应力张量和结条件

DOI:
10.1103/physrevd.105.024001
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发表时间:
2022
期刊:
影响因子:
5
通讯作者:
Mottola, Emil
Mottola, Emil
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Beltracchi, Philip;Gondolo, Paolo;Mottola, Emil

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导出了在旋转零水平面上加入不同内外几何形状的无限小薄壳的表面应力张量的一般形式。虽然曲面上的诱导度规必须从两边接近相同,但度规的一阶导数不必相同。这样的不连续导致了在视界上定位的爱因斯坦张量中的狄拉克分布。对于一般的静止轴对称几何,表面应力张量可以用表征表面的两个几何不变量来表示,即不连续[]和表面重力和角动量密度。Komar能量和角动量以适应于杀戮对称的坐标给出,表面对两者的贡献由[]和确定。在这些条件的指导下,直接从爱因斯坦张量密度验证了对原始以色列结条件的简单修改,以给出正确的表面应力有限结果,当允许表面的法向n连续趋向于零向量时。给出了在零曲面上失效的原始结条件与以色列结条件的关系。修正的结条件适用于旋转的“黑洞”外部与任何在Kerr零视界表面连接的内部几何结构的匹配,即使表面法线本身是不连续的,barrabs - israel形式主义也不适用。这种在旋转零视界上的结合纯粹是物质壳型的,不包含传播的重力激波。
The general form of the surface stress tensor of an infinitesimally thin shell located on a rotating null horizon is derived, when different interior and exterior geometries are joined there. Although the induced metric on the surface must be the same approached from either side, the first derivatives of the metric need not be. Such discontinuities lead to a Dirac-distribution in the Einstein tensor localized on the horizon. For a general stationary axisymmetric geometry the surface stress tensor can be expressed in terms of two geometric invariants that characterize the surface, namely the discontinuities [] andof the surface gravityand angular momentum density. The Komar energy and angular momentum are given in coordinates adapted to the Killing symmetries, and the surface contributions to each determined in terms of [] and. Guided by these, a simple modification of the original Israel junction conditions is verified directly from the Einstein tensor density to give the correct finite result for the surface stress, when the normal n to the surface is allowed to tend continuously to a null vector. The relation to Israel’s original junction conditions, which fail on null surfaces, is given. The modified junction conditions are suitable to the matching of a rotating “black hole” exterior to any interior geometry joined at the Kerr null horizon surface, even when the surface normal is itself discontinuous and the Barrabès-Israel formalism is also inapplicable. This joining on a rotating null horizon is purely of the matter shell type and does not contain a propagating gravitational shock wave.
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