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arXiv 1807.08620gr-qc
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宇宙学背景下与引力非最小耦合的标量场的凝聚

Condensation of a scalar field non-minimally coupled to gravity in a cosmological context

Amir Ghalee

摘要:

本文提出了一种新的凝聚耦合到高斯-邦纳项的标量场的机制。我们提出了一个方案,其中凝聚态将出现在宇宙后期的背景能量密度。在辐射和尘埃占主导地位的时代,标量场的能量密度,$ρ_φ$,以低于背景密度的速度下降。最终,$ρ_φ$支配尘埃的能量密度,标量场可以被压缩。在凝聚相,我们有德西特相宇宙与$ρ_φ=3H_0^2M_P^2$。此外,我们还研究了该模型的宇宙学扰动,并探讨了该模型的预言。

英文摘要:

We present a new mechanism to condense a scalar field coupled to the Gauss-Bonnet term. We propose a scenario in which the condensed state will emerge from the background energy density in the late-Universe. During the radiation and dust-dominated eras, the energy density of the scalar field, $ρ_φ$, decreases at a slower rate than the background density. Eventually, $ρ_φ$ dominates over the energy density of dust and the scalar field could be condensed. In the condensed phase, we have the de Sitter phase for the universe with $ρ_φ=3H_0^2M_P^2$. Moreover, we study the cosmological perturbations of the model and explore predictions of the model.

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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