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2022

The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation

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

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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.

The Inflated Chern-Simons Number in Spectator Chromo-Natural Inflation · Around

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