Trans-Planckian censorship constraints on properties and cosmological applications of axion-like fields
arXiv:2310.05901 · doi:10.1016/j.physletb.2023.138251
Abstract
We use the Trans-Planckian Censorship Conjecture (TCC) to constrain the decay constants characterizing a set of N identical axion-like fields with cosine potentials, improving upon the precision of other Swampland conjectures and existing string-theoretic arguments. We find that consistency with the TCC requires any such set of axion-like fields to satisfy , where is the reduced Planck mass. We show that this bound makes models of axion-driven inflation incapable of simultaneously producing the required number of e-foldings and the observed scalar spectral tilt. In contrast, we find that models of axion quintessence can be simultaneously compatible with the TCC and observational data, provided that the axions' initial field values are set near the maxima of their potentials to within roughly .
arXiv comment7 pages, 2 figures
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