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Karananas, Georgios K. (2018): On the strong-CP problem and its axion solution in torsionful theories. In: European Physical Journal C, Bd. 78, Nr. 6, 480 [PDF, 327kB]

Abstract

Gravitational effectsmay interferewith the axion solution to the strong-CP problem. We point out that gravity can potentially provide a protectionmechanism against itself, in the form of an additional axion-like field associated with torsion.

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