Abstract
We calculate high-precision constraints on Natural Inflation relative to current observational constraints from Planck 2018 + BICEP/Keck(BK15) Polarization + BAO on r and n S, including post-inflationary history of the universe. We find that, for conventional post-inflationary dynamics, Natural Inflation with a cosine potential is disfavored at greater than 95% confidence out by current data. If we assume protracted reheating characterized by w>1/3, Natural Inflation can be brought into agreement with current observational constraints. However, bringing unmodified Natural Inflation into the 68% confidence region requires values of T re below the scale of electroweak symmetry breaking. The addition of a SHOES prior on the Hubble Constant H 0 only worsens the fit.
| Original language | English |
|---|---|
| Article number | 022 |
| Journal | Journal of Cosmology and Astroparticle Physics |
| Volume | 2022 |
| Issue number | 1 |
| DOIs | |
| State | Published - Jan 2022 |
Keywords
- cosmological phase transitions
- inflation
- physics of the early universe
- power spectrum
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