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Solving the strong CP problem

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arxiv 2501.16427 v1 pith:DNIX77MJ submitted 2025-01-27 hep-ph

Alessandro Strumia This is my paper · ORCID
classification hep-ph
keywords invarianceproblemstrongaxionsbrieflybrokencp-invarianceflavour
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I briefly review solutions to the strong CP problem based on axions, parity invariance, CP-invariance, and present a new idea based on CP as part of a spontaneously broken flavour symmetry such as a U(1) or modular invariance.

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Cited by 1 Pith paper

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  1. On the Origins of the Strong CP Problem

    hep-ph 2026-07 accept novelty 6.0 of 10

    The conventional strong CP problem is contingent on extra global topological assumptions about gauge fields that no established QCD observable is shown to require.

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