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arXiv 2003.07109gr-qchep-ph
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对称引力闭合

Symmetric gravitational closure

Maximilian Düll, Nils L. Fischer, Bjoern Malte Schaefer, Frederic P. Schuller

摘要:

我们将展示如何利用对称性假设来确定特定几何形状的动力学方程,该几何形状支撑给定的物质场方程。该程序建立在没有任何先验对称性假设的物质模型的引力闭合方程上。这足以说明在洛伦兹背景下的克莱因-戈登场方程的对称化过程,对于这种对称化过程,人们在不知道爱因斯坦方程的情况下,通过仔细地将最大宇宙对称性直接强加给相关的引力闭合方程,就可以得到弗里德曼方程。这种寻找与给定的物质动力学相容的勒夫约化的引力场方程族的方法直接推广到任何基灵对称代数、标准模型之外的物质模型以及洛伦兹度规之外的张量时空几何。

英文摘要:

We show how to exploit symmetry assumptions to determine the dynamical equations for the particular geometry that underpins given matter field equations. The procedure builds on the gravitational closure equations for matter models without any a priori assumption of symmetry. It suffices to illustrate the symmetrization procedure for a Klein-Gordon field equation on a Lorentzian background, for which one obtains the Friedmann equations, without ever having known Einstein's equations, by careful imposition of maximal cosmological symmetry directly on the pertinent gravitational closure equations. This method of finding the family of symmetry-reduced gravitational field equations that are compatible with given matter dynamics directly generalizes to any Killing symmetry algebra, matter models beyond the standard model and indeed tensorial spacetime geometries beyond Lorentzian metrics.

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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