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Title: Tensor modes in pure natural inflation

We study tensor modes in pure natural inflation, 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.
Authors:
ORCiD logo [1] ; ORCiD logo [2]
  1. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States); Univ. of Tokyo, Chiba (Japan)
  2. Univ. of Tokyo, Chiba (Japan)
Publication Date:
Grant/Contract Number:
AC02-05CH11231; 15K17634
Type:
Published Article
Journal Name:
Physics Letters. Section B
Additional Journal Information:
Journal Volume: 780; Journal Issue: C; Related Information: © 2018; Journal ID: ISSN 0370-2693
Publisher:
Elsevier
Research Org:
Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
Sponsoring Org:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS
OSTI Identifier:
1423905
Alternate Identifier(s):
OSTI ID: 1461997

Nomura, Yasunori, and Yamazaki, Masahito. Tensor modes in pure natural inflation. United States: N. p., Web. doi:10.1016/j.physletb.2018.02.071.
Nomura, Yasunori, & Yamazaki, Masahito. Tensor modes in pure natural inflation. United States. doi:10.1016/j.physletb.2018.02.071.
Nomura, Yasunori, and Yamazaki, Masahito. 2018. "Tensor modes in pure natural inflation". United States. doi:10.1016/j.physletb.2018.02.071.
@article{osti_1423905,
title = {Tensor modes in pure natural inflation},
author = {Nomura, Yasunori and Yamazaki, Masahito},
abstractNote = {We study tensor modes in pure natural inflation, 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.},
doi = {10.1016/j.physletb.2018.02.071},
journal = {Physics Letters. Section B},
number = C,
volume = 780,
place = {United States},
year = {2018},
month = {3}
}