The inflated Chern-Simons number in spectator chromo-natural inflation

Bagherian, Hengameh; Reece, Matthew; Xu, Weishuang Linda

doi:10.1007/jhep01(2023)099

Title: The inflated Chern-Simons number in spectator chromo-natural inflation

Journal Article · Wed Jan 18 00:00:00 EST 2023 · Journal of High Energy Physics (Online)

DOI:https://doi.org/10.1007/jhep01(2023)099· OSTI ID:2242452

^[1];

^[2]

Harvard University, Cambridge, MA (United States)
University of California, Berkeley, CA (United States); Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

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.

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Research Organization:: Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), High Energy Physics (HEP); National Aeronautics and Space Administration (NASA)

Grant/Contract Number:: AC02-05CH11231; SC0013607; 80NSSC20K0506

OSTI ID:: 2242452

Journal Information:: Journal of High Energy Physics (Online), Vol. 2023, Issue 1; ISSN 1029-8479

Publisher:: Springer NatureCopyright Statement

Country of Publication:: United States

Language:: English

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