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arXiv 2106.16014gr-qcastro-ph.CO
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第一性原理的宇宙加速

Cosmic acceleration from first principles

Juan Garcia-Bellido, Llorenc Espinosa-Portales

摘要:

广义相对论熵加速度理论可以从第一性原理解释目前的宇宙加速度,而不需要引入宇宙学常数。在均质各向同性Friedmann-Lemaitre-Robertson-Walker(FLRW)度规的背景下,我们通过非平衡态现象的协变表述,发现熵的增长与宇宙的因果视界有关(在无限膨胀中的有限气泡内)引起的加速度基本上与$Λ$ CDM的加速度不可区分,除了与$Λ$ CDM中CMB的预期相比稍大的当前扩展速率之外,可能解决所谓的$H_0$张力。宇宙的物质含量是不变的,巧合的问题得到解决,因为它是引入这种新的相对论熵力的因果视界的增长。宇宙学常数变得不必要,未来的超曲面是闵可夫斯基而不是德西特。

英文摘要:

General relativistic entropic acceleration theory may explain the present cosmic acceleration from first principles without the need of introducing a cosmological constant. Following the covariant formulation of non-equilibrium phenomena in the context of a homogeneous and isotropic Friedmann-Lemaitre-Robertson-Walker (FLRW) metric, we find that the growth of entropy associated with the causal horizon of our universe (inside a finite bubble in eternal inflation) induces an acceleration that is essentially indistinguishable from that of $Λ$CDM, except for a slightly larger present rate of expansion compared to what would be expected from the CMB in $Λ$CDM, possibly solving the so-called $H_0$ tension. The matter content of the universe is unchanged and the coincidence problem is resolved since it is the growth of the causal horizon of matter that introduces this new relativistic entropic force. The cosmological constant is made unnecessary and the future hypersurface is Minkowsky rather than de Sitter.

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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