Abstract
In this chapter we address the first truly stringy cosmological model, the string gas model, started by Brandenberger and Vafa. The reason for the model starts with a very simple observation: If inflation lasts for more than 70 e-folds (which admittedly is not necessary, we need more than 50–60 e-folds, but restricting \(N_e<70\) would not be needed for experimental reasons, only for calculational reasons, which seems unreasonable), then current cosmological scales, \(\sim H_0^{-1}\), that leave an imprint in the CMBR, were less than Planck size \(l_\mathrm{Pl}\) at the initial time. But then we cannot trust the effective field theory of inflation, and we would need a full quantum gravity theory, like string theory.
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Năstase, H. (2019). String Gas Cosmology: Basics and Brandenberger-Vafa Scenario. In: Cosmology and String Theory. Fundamental Theories of Physics, vol 197. Springer, Cham. https://doi.org/10.1007/978-3-030-15077-8_32
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DOI: https://doi.org/10.1007/978-3-030-15077-8_32
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