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arXiv 1903.06830hep-thgr-qc
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引力的几何三位一体

The Geometrical Trinity of Gravity

Jose Beltran Jimenez, Lavinia Heisenberg, Tomi S. Koivisto

摘要:

引力的几何性质来自等效原理所规定的普遍性。在广义相对论的通常表述中,引力相互作用的几何化是根据时空曲率进行的,这是现在对引力的标准解释。然而,这不是唯一的可能性。在这些笔记中,我们讨论了平坦时空中的广义相对论的两种替代的、尽管是等价的表述,在这种表述中,引力完全归因于挠率或非度规性,从而提出了同一基本理论的三种看似无关的表述的存在。基于这三种不同的广义相对论表述,我们讨论了广义相对论的一些扩展。

英文摘要:

The geometrical nature of gravity emerges from the universality dictated by the equivalence principle. In the usual formulation of General Relativity, the geometrisation of the gravitational interaction is performed in terms of the spacetime curvature, which is now the standard interpretation of gravity. However, this is not the only possibility. In these notes we discuss two alternative, though equivalent, formulations of General Relativity in flat spacetimes, in which gravity is fully ascribed either to torsion or to non-metricity, thus putting forward the existence of three seemingly unrelated representations of the same underlying theory. Based on these three alternative formulations of General Relativity, we then discuss some extensions.

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