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arXiv 2011.05891gr-qcastro-ph.CO
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Quasi-geodesics in relativistic gravity

Valerio Faraoni, Geneviève Vachon

摘要:

平行于大质量粒子轨道的四个力总是可以通过仿射参数化来消除,但是仿射参数与适当的时间不同。主要应用是宇宙学,其中宇宙流体的元素受到平行于其四个速度的压力梯度的影响。当粒子质量发生变化时,在标量张量宇宙学中,自然会出现平行的四种力。

英文摘要:

A four-force parallel to the trajectory of a massive particle can always be eliminated by going to an affine parametrization, but the affine parameter is different from the proper time. The main application is to cosmology, in which elements of the cosmic fluid are subject to a pressure gradient parallel to their four-velocities. Natural implementations of parallel four-forces occur when the particle mass changes and in scalar-tensor cosmology.

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