期刊
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
卷 -, 期 1, 页码 -出版社
IOP Publishing Ltd
DOI: 10.1088/1475-7516/2022/01/022
关键词
inflation; physics of the early universe; cosmological phase transitions; power spectrum
资金
- National Science Foundation [NSF-PHY-1719690, NSF-PHY-2014021]
The study found that under conventional post-inflationary dynamics, Natural Inflation with a cosine potential is disfavored by current data with a confidence level of over 95%. When considering prolonged reheating, Natural Inflation can be consistent with current observational constraints, but requires values of T-re below the scale of electroweak symmetry breaking. Adding a SHOES prior on the Hubble Constant H-0 only worsens the fit.
We calculate high-precision constraints on Natural Inflation relative to current observational constraints from Planck 2018 + BICEP/Keck(BK15) Polarization + BAO on r and nS, 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) over bar > 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.
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