Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
8186635 | Physics Letters B | 2018 | 5 Pages |
Abstract
We study tensor modes in pure natural inflation [1], a recently-proposed inflationary model in which an axionic inflaton couples to pure Yang-Mills gauge fields. We find that the tensor-to-scalar ratio r is naturally bounded from below. This bound originates from the finiteness of the number of metastable branches of vacua in pure Yang-Mills theories. Details of the model can be probed by future cosmic microwave background experiments and improved lattice gauge theory calculations of the θ-angle dependence of the vacuum energy.
Related Topics
Physical Sciences and Engineering
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Authors
Yasunori Nomura, Masahito Yamazaki,