On the strong-CP problem and its axion solution in torsionful theories
arXiv:1805.08781 · doi:10.1140/epjc/s10052-018-5972-0
Abstract
Gravitational effects may interfere with the axion solution to the strong-CP problem. We point out that gravity can potentially provide a protection mechanism against itself, in the form of an additional axion-like field associated with torsion.
7 pages, no figures