2006.16182v2.pdf (6.98 MB)
The first three seconds: a review of possible expansion histories of the early universe
journal contribution
posted on 2023-06-09, 22:57 authored by Rouzbeh Allahverdi, Mustafa A Amin, Asher Berlin, Nicolas Bernal, Christian ByrnesChristian Byrnes, M Sten Delos, Adrienne L Erickcek, Miguel Escudero, Daniel G Figueroa, Katherine Freese, Tomohiro Harada, Dan Hooper, David I Kaiser, Tanvi Karwal, Kazunori Kohri, othersIt is commonly assumed that the energy density of the Universe was dominated by radiation between reheating after inflation and the onset of matter domination 54,000 years later. While the abundance of light elements indicates that the Universe was radiation dominated during Big Bang Nucleosynthesis (BBN), there is scant evidence that the Universe was radiation dominated prior to BBN. It is therefore possible that the cosmological history was more complicated, with deviations from the standard radiation domination during the earliest epochs. Indeed, several interesting proposals regarding various topics such as the generation of dark matter, matter-antimatter asymmetry, gravitational waves, primordial black holes, or microhalos during a nonstandard expansion phase have been recently made. In this paper, we review various possible causes and consequences of deviations from radiation domination in the early Universe - taking place either before or after BBN - and the constraints on them, as they have been discussed in the literature during the recent years.
Funding
Reaching a qualitatively new understanding of the post-Planck universe; G1935; ROYAL SOCIETY; UF150683
History
Publication status
- Published
File Version
- Accepted version
Journal
The Open Journal of AstrophysicsISSN
2565-6120Publisher
Maynooth Academic PublishingExternal DOI
Issue
1Volume
4Page range
1-67Department affiliated with
- Physics and Astronomy Publications
Full text available
- Yes
Peer reviewed?
- Yes
Legacy Posted Date
2021-02-02First Open Access (FOA) Date
2021-02-02First Compliant Deposit (FCD) Date
2021-02-01Usage metrics
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