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arXiv 2009.06950gr-qc
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引力作为广义相对论嵌入暗物质的非相对论极限

Non-relativistic limit of embedding gravity as General Relativity with dark matter

S. A. Paston

摘要:

雷吉-泰特尔博伊姆嵌入引力是基于一个简单的弦启发几何原理的修正引力:我们的时空在这里被认为是一个平面中的四维表面。这一理论与最近流行的拟引力理论相似:引力的修正在这两种理论中都是由于变量在广义相对论作用下的变化而出现的。嵌入引力和模拟引力都可以用来解释暗物质之谜,因为在这两种情况下,修正后的理论都可以用附加了虚构物质(嵌入物质或模拟物质)的广义相对论来表示。对于一般情况,我们得到了嵌入物质的运动方程作为一组一阶动力学方程和与之一致的约束条件。然后,我们构造了这些方程的非相对论极限,其中嵌入物质的运动被证明是足够慢的,以便它可以扮演冷暗物质的角色。非相对论嵌入物质具有一定的自相互作用,这在解决Lambda CDM模型中出现的核心尖点问题时可能很有用。

英文摘要:

Regge-Teitelboim embedding gravity is the modified gravity based on a simple string-inspired geometrical principle: our spacetime is considered here as a 4-dimensional surface in a flat bulk. This theory is similar to the recently popular theory of mimetic gravity: the modification of gravity appears in both theories as a result of the change of variables in the action of General Relativity. Embedding gravity, as well as mimetic gravity, can be used in explaining the dark matter mystery since, in both cases, the modified theory can be presented as General Relativity with additional fictitious matter (embedding matter or mimetic matter). For the general case, we obtain the equations of motion of embedding matter in terms of embedding function as a set of first-order dynamical equations and constraints consistent with them. Then we construct a non-relativistic limit of these equations, in which the motion of embedding matter turns out to be slow enough so that it can play the role of cold dark matter. The non-relativistic embedding matter turns out to have a certain self-interaction, which could be useful in the context of solving the core-cusp problem that appears in the LambdaCDM model.

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