Semiclassical Gravity and Invisible Axions

Details Semiclassical Gravity and Invisible Axions Semiclassical Gravity and Invisible Axions

1992-07-03

arxiv.org/abs/hep-ph/9207208v1

Phys.Rev.Lett.71:320-323,1993

Physics

High Energy Physics

High Energy Physics - Phenomenology

13 pages, NSF-ITP-92-85

Scientific paper

10.1103/PhysRevLett.71.320

We show that charged Eguchi-Hanson instantons provide a concrete and calculable new source of intrinsic Peccei-Quinn symmetry breaking by quantum gravity. The size of this breaking is shown to depend sensitively on the short distance details of a given theory, but is generically suppressed by fermion zero modes. Demanding that these gravitational effects not affet the axion solution to the strong CP problem, we find that at least two sets of quarks with differing Peccei-Quinn charges are required. In addition, these effects obviate the cosmological axion domain wall problem but leave unchanged problems associated with coherent axion oscillations.

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