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arXiv 2306.03386gr-qcastro-ph.COhep-th
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扭率耦合伸缩子幽灵凝聚的相空间分析

Phase-space analysis of torsion-coupled dilatonic ghost condensate

Manuel Gonzalez-Espinoza, Giovanni Otalora, Yoelsy Leyva, Joel Saavedra

AI总结:

本文研究了通过扭率与引力非最小耦合的伸缩子幽灵凝聚场的宇宙学动力学,通过相空间分析找到了临界点与稳定性条件,发现其能缓解暗能量尺度问题并在晚期趋向暗能量主导的吸引子。

摘要:

我们研究了作为暗能量来源的伸缩子幽灵凝聚场的宇宙学动力学,该场通过扭率与引力非最小耦合。我们通过寻找所有临界点及其稳定性条件,进行了详细的相空间分析。此外,我们将结果与最新的 $H(z)$ 和 Supernovae Ia 观测数据进行了比较。特别地,我们发现了暗物质时代标度机制存在的条件。进一步地,我们得到了成功退出标度机制的条件,使得在晚期,宇宙趋向于描述暗能量主导时代的吸引子点。这些引人注目的特征使我们能够缓解暗能量的能量尺度问题,因为在标度机制期间,场能量密度在早期不一定可以忽略。

英文摘要:

We studied the cosmological dynamics of a dilatonic ghost condensate field as a source of dark energy, which is non-minimally coupled to gravity through torsion. We performed a detailed phase-space analysis by finding all the critical points and their stability conditions. Also, we compared our results with the latest $H(z)$ and Supernovae Ia observational data. In particular, we found the conditions for the existence of scaling regimes during the dark matter era. Furthermore, we obtained the conditions for a successful exit from the scaling regime, such that, at late times, the universe tends towards an attractor point describing the dark energy-dominated era. These intriguing features can allow us to alleviate the energy scale problem of dark energy since, during a scaling regime, the field energy density is not necessarily negligible at early times.

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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