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Absence of CP Violation in the Strong Interaction: Vacuum thwarts Axion
Published 6 Feb 2025 in hep-lat, hep-ph, hep-th, and nucl-th | (2502.04092v1)
Abstract: QCD admits a contribution to the action, the $\theta$ term, which potentially gives rise to nontrivial phases and violates CP. This is essentially a question of how the vacuum reacts to the $\theta$ term. In this talk I will address the problem using new developments on the lattice. The overall solution is contrasted with the axion `solution'.
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