# Tensor modes in pure natural inflation

## Abstract

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:

- Publication Date:

- Research Org.:
- Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)

- OSTI Identifier:
- 1423905

- Alternate Identifier(s):
- OSTI ID: 1461997

- Grant/Contract Number:
- AC02-05CH11231; 15K17634

- Resource Type:
- Published Article

- Journal Name:
- Physics Letters B

- Additional Journal Information:
- Journal Name: Physics Letters B Journal Volume: 780 Journal Issue: C; Journal ID: ISSN 0370-2693

- Publisher:
- Elsevier

- Country of Publication:
- Netherlands

- Language:
- English

- Subject:
- 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

### Citation Formats

```
Nomura, Yasunori, and Yamazaki, Masahito. Tensor modes in pure natural inflation. Netherlands: N. p., 2018.
Web. doi:10.1016/j.physletb.2018.02.071.
```

```
Nomura, Yasunori, & Yamazaki, Masahito. Tensor modes in pure natural inflation. Netherlands. doi:10.1016/j.physletb.2018.02.071.
```

```
Nomura, Yasunori, and Yamazaki, Masahito. Tue .
"Tensor modes in pure natural inflation". Netherlands. 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 B},

number = C,

volume = 780,

place = {Netherlands},

year = {2018},

month = {5}

}

Free Publicly Available Full Text

Publisher's Version of Record

DOI: 10.1016/j.physletb.2018.02.071

DOI: 10.1016/j.physletb.2018.02.071

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Cited by: 3 works

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Works referencing / citing this record:

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