Stasis in an expanding universe: A recipe for stable mixed-component cosmological eras

Stasis in an expanding universe: A recipe for stable mixed-component cosmological eras
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膨胀宇宙中的停滞:稳定混合成分宇宙学时代的秘诀

DOI:
10.1103/physrevd.105.023530
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发表时间:
2022
期刊:
影响因子:
5
通讯作者:
Thomas, Brooks
Thomas, Brooks
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Dienes, Keith R.;Heurtier, Lucien;Huang, Fei;Kim, Doojin;Tait, Tim M. P.;Thomas, Brooks

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膨胀宇宙的一个特征是其不同成分的宇宙丰度随时间的变化。例如,一个辐射主导的宇宙不可避免地让位于一个物质主导的宇宙,而像物质辐射平等这样的关键时刻是短暂的。在本文中,我们指出,这一传说并不总是正确的,它是可能的,以获得一种形式的“停滞”,其中的相对宇宙学丰度的不同组件保持不变,在延长宇宙学时期,即使宇宙膨胀。此外,我们证明,这种情况是没有微调,但实际上是在某些宇宙学框架内的全球吸引子,宇宙自然地朝着这样的长期停滞期的各种初始条件。因此,这种停滞状态的存在在整个宇宙学时间轴上产生了许多新的理论可能性,从原始密度扰动、暗物质产生和结构形成的潜在影响,一直到早期再加热、早期物质主导时代,甚至宇宙的年龄。
One signature of an expanding universe is the time variation of the cosmological abundances of its different components. For example, a radiation-dominated universe inevitably gives way to a matter-dominated universe, and critical moments such as matter-radiation equality are fleeting. In this paper, we point out that this lore is not always correct and that it is possible to obtain a form of “stasis” in which the relative cosmological abundancesof the different components remain unchanged over extended cosmological epochs, even as the universe expands. Moreover, we demonstrate that such situations are not fine-tuned but are actually global attractors within certain cosmological frameworks, with the universe naturally evolving toward such long-lasting periods of stasis for a wide variety of initial conditions. The existence of this kind of stasis therefore gives rise to a host of new theoretical possibilities across the entire cosmological timeline, ranging from potential implications for primordial density perturbations, dark-matter production, and structure formation all the way to early reheating, early matter-dominated eras, and even the age of the Universe.
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