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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, Vol. 78, No. 6, 480
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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.