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
影响因子:
5
通讯作者:
Thomas, Brooks
中科院分区:
文献类型:
--
作者:
Dienes, Keith R.;Heurtier, Lucien;Huang, Fei;Kim, Doojin;Tait, Tim M. P.;Thomas, Brooks
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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影响因子:
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作者:
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通讯作者:
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影响因子:
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DOI:
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期刊:
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DOI:
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DOI:
--
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2001
期刊:
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