Spontaneously Broken (-1)-Form U(1) Symmetries

2024/01/31 by Aloni, Daniel, García-Valdecasas, Eduardo, Reece, Matthew +1 · 2 citations
#FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High Energy Physics - Theory (hep-th)

paper · doi:10.48550/arxiv.2402.00117

Abstract

Spontaneous breaking of symmetries leads to universal phenomena. We extend this notion to (-1)-form U(1) symmetries. The spontaneous breaking is diagnosed by a dependence of the vacuum energy on a constant background field θ, which can be probed by the topological susceptibility. This leads to a reinterpretation of the Strong CP problem as arising from a spontaneously broken instantonic symmetry in QCD. We discuss how known solutions to the problem are unified in this framework and explore some, so far unsuccessful, attempts to find new solutions.

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