Cosmological signatures of time-asymmetric gravity
Cosmological signatures of time-asymmetric gravity
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DOI：
10.1103/physrevd.94.123514
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发表时间：
2016-06
影响因子：
5
通讯作者：
Marina Cortês;A. Liddle;L. Smolin
中科院分区：
文献类型：
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作者：
Marina Cortês;A. Liddle;L. Smolin
我们发展了Cort ^es，Gomes和Smolin提出的模型，来预测他们最近提出的广义相对论时间非对称扩展的宇宙学特征.在这类模型中，手征费米子的运动方程被扭转项修正。这一项导致了中微子的色散定律，它将一个新的随时间变化的能量与每个粒子联系起来。我们发现一个新的中微子的贡献弗里德曼方程产生的扭转项在Ashtekar连接。在这篇文章中，我们探讨了这个术语的现象学和宇宙学演化的观测结果。我们表明，对临界能量密度的限制通常会使这一项小得不可观测，最大值为今天中微子能量密度的10 ^{-25}$。然而，如果时间不对称的暗能量被调整以抵消宇宙常数，扭转效应可能是暗物质的候选者。
We develop the model proposed by Cort\^es, Gomes & Smolin, to predict cosmological signatures of time-asymmetric extensions of general relativity they proposed recently. Within this class of models the equation of motion of chiral fermions is modified by a torsion term. This term leads to a dispersion law for neutrinos that associates a new time-varying energy with each particle. We find a new neutrino contribution to the Friedmann equation resulting from the torsion term in the Ashtekar connection. In this note we explore the phenomenology of this term and observational consequences for cosmological evolution. We show that constraints on the critical energy density will ordinarily render this term unobservably small, a maximum of order $10^{-25}$ of the neutrino energy density today. However, if the time-asymmetric dark energy is tuned to cancel the cosmological constant, the torsion effect may be a dark matter candidate.