Stasis in an expanding universe: A recipe for stable mixed-component cosmological eras
AffiliationDepartment of Physics, University of Arizona
MetadataShow full item record
PublisherAmerican Physical Society
CitationDienes, K. R., Heurtier, L., Huang, F., Kim, D., Tait, T. M. P., & Thomas, B. (2022). Stasis in an expanding universe: A recipe for stable mixed-component cosmological eras. Physical Review D.
JournalPhysical Review D
RightsCopyright © 2022 American Physical Society.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractOne 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 abundances ωi of 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. © 2022 us.
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