The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe

@article{Allahverdi2021TheFT,
  title={The First Three Seconds: a Review of Possible Expansion Histories of the Early Universe},
  author={Rouzbeh Allahverdi and Mustafa A. Amin and Asher Berlin and Nicol{\'a}s Bernal and Christian T. Byrnes and M. Sten Delos and Adrienne L. Erickcek and Miguel Escudero and Daniel G. Figueroa and Katherine Freese and Tomohiro Harada and Dan Hooper and David I. Kaiser and Tanvi Karwal and Kazunori Kohri and Gordan Krnjaic and Marek Lewicki and Kaloian D. Lozanov and Vivian Poulin and Kuver Sinha and Tristan L. Smith and Tomo Takahashi and Tommi Tenkanen and James Unwin and Ville Vaskonen and Scott Watson},
  journal={The Open Journal of Astrophysics},
  year={2021}
}
It 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… 

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