论文标题
非零扭转和晚期宇宙学
Non-zero torsion and late cosmology
论文作者
论文摘要
在这项工作中，我们研究了一些与扭转相关的热力学方面，在平坦的时空宇宙进化中。通过为扭转项实施两个Ansatze，我们发现该模型允许幻影制度或典型行为。该方案在热力学水平上与$λ$ CDM模型不同。由此产生的宇宙膨胀不是绝热的，对热力学的第二定律的实现需要正扭转项，并且宇宙流体的温度始终为正。扭转幻像场景的熵为负，但引入化学势可以解决此问题。对于狄拉克山型宇宙，扭转导致流体温度的行为不断增长，但没有发生膨胀速率的发生率。
In this work, we study some thermodynamical aspects associated with torsion in a flat FLRW spacetime cosmic evolution. By implementing two Ansatze for the torsion term, we find that the model admits a phantom regime or a quintessence behavior. This scheme differs from the $Λ$CDM model at the thermodynamical level. The resulting cosmic expansion is not adiabatic, the fulfillment of the second law of thermodynamics requires a positive torsion term, and the temperature of the cosmic fluid is always positive. The entropy of the torsion phantom scenario is negative, but introducing chemical potential solves this issue. For a Dirac-Milne type Universe, the torsion leads to a growing behavior for the temperature of the fluid but has no incidence on the rate of expansion.
