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arXiv 2203.13845gr-qc
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广义相对论中物质的角动量与诺特荷的局域连续性

Local Continuity of Angular Momentum and Noether Charge for Matter in General Relativity

Robin Croft

AI总结:

该研究拓展广义相对论物质连续性研究至角动量与规范对称诺特流范畴,推导相关表达式并以三维玻色星碰撞为例验证方法。

摘要:

守恒律在数值相对论中有诸多应用。然而,由于缺乏坐标平移对称性,为一般动态时空定义局域守恒律并非易事。在平直空间中,有限类空体积内能量-动量的变化率等于该体积表面上积分的通量;但对于一般时空,必须加入一项由时空曲率产生的源项的体积分。本文将广义相对论中物质连续性的研究拓展至包含物质角动量以及与规范对称性相关的诺特流的范畴。利用该形式体系,推导得到了复标量场与复Proca场的诺特荷与通量的表达式。本文还推导了角动量密度、通量与源的表达式,并将其应用于具有非零碰撞参数的三维玻色星数值相对论碰撞过程,以作为这些方法的示例。

英文摘要:

Conservation laws have many applications in numerical relativity. However, it is not straightforward to define local conservation laws for general dynamic spacetimes due the lack of coordinate translation symmetries. In flat space, the rate of change of energy-momentum within a finite spacelike volume is equivalent to the flux integrated over the surface of this volume; for general spacetimes it is necessary to include a volume integral of a source term arising from spacetime curvature. In this work a study of continuity of matter in general relativity is extended to include angular momentum of matter and Noether currents associated with gauge symmetries. Expressions for the Noether charge and flux of complex scalar fields and complex Proca fields are found using this formalism. Expressions for the angular momentum density, flux and source are also derived which are then applied to a numerical relativity collision of boson stars in 3D with non-zero impact parameter as an illustration of the methods.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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