The inflated Chern-Simons number in spectator chromo-natural inflation
Abstract
The chromo-natural inflation (CNI) scenario predicts a potentially detectable chiral gravitational wave signal, generated by a Chern-Simons coupling between a rolling scalar axion field and an SU(2) gauge field with an isotropy-preserving classical background during inflation. However, the generation of this signal requires a very large integer Chern-Simons level, which can be challenging to explain or embed in a UV-complete model. We show that this challenge persists in the phenomenologically viable spectator field CNI (S-CNI) model. Furthermore, we show that a clockwork scenario giving rise to a large integer as a product of small integers can never produce a Chern-Simons level large enough to have successful S-CNI phenomenology. We briefly discuss other constraints on the model, both in effective field theory based on partial-wave unitarity bounds and in quantum gravity based on the Weak Gravity Conjecture, which may be relevant for further explorations of alternative UV completions.
- Authors:
-
[1];
[1];
[2]
- Harvard University, Cambridge, MA (United States)
- University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Publication Date:
- Research Org.:
- Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA)
- OSTI Identifier:
- 2242452
- Grant/Contract Number:
- AC02-05CH11231; SC0013607; 80NSSC20K0506
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Journal of High Energy Physics (Online)
- Additional Journal Information:
- Journal Name: Journal of High Energy Physics (Online); Journal Volume: 2023; Journal Issue: 1; Journal ID: ISSN 1029-8479
- Publisher:
- Springer Nature
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; Axions and ALPs; Chern-Simons Theories; Cosmology of Theories BSM; Early Universe Particle Physics
Citation Formats
Bagherian, Hengameh, Reece, Matthew, and Xu, Weishuang Linda. The inflated Chern-Simons number in spectator chromo-natural inflation. United States: N. p., 2023.
Web. doi:10.1007/jhep01(2023)099.
Bagherian, Hengameh, Reece, Matthew, & Xu, Weishuang Linda. The inflated Chern-Simons number in spectator chromo-natural inflation. United States. https://doi.org/10.1007/jhep01(2023)099
Bagherian, Hengameh, Reece, Matthew, and Xu, Weishuang Linda. Wed .
"The inflated Chern-Simons number in spectator chromo-natural inflation". United States. https://doi.org/10.1007/jhep01(2023)099. https://www.osti.gov/servlets/purl/2242452.
@article{osti_2242452,
title = {The inflated Chern-Simons number in spectator chromo-natural inflation},
author = {Bagherian, Hengameh and Reece, Matthew and Xu, Weishuang Linda},
abstractNote = {The chromo-natural inflation (CNI) scenario predicts a potentially detectable chiral gravitational wave signal, generated by a Chern-Simons coupling between a rolling scalar axion field and an SU(2) gauge field with an isotropy-preserving classical background during inflation. However, the generation of this signal requires a very large integer Chern-Simons level, which can be challenging to explain or embed in a UV-complete model. We show that this challenge persists in the phenomenologically viable spectator field CNI (S-CNI) model. Furthermore, we show that a clockwork scenario giving rise to a large integer as a product of small integers can never produce a Chern-Simons level large enough to have successful S-CNI phenomenology. We briefly discuss other constraints on the model, both in effective field theory based on partial-wave unitarity bounds and in quantum gravity based on the Weak Gravity Conjecture, which may be relevant for further explorations of alternative UV completions.},
doi = {10.1007/jhep01(2023)099},
journal = {Journal of High Energy Physics (Online)},
number = 1,
volume = 2023,
place = {United States},
year = {Wed Jan 18 00:00:00 EST 2023},
month = {Wed Jan 18 00:00:00 EST 2023}
}
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