Gravitational Properties of the Monopole Bag

Abstract

Axionic cosmologies constitute a class of models with phenomenologically rich symmetry breaking in the early universe. In the case where monopoles are present in such a background, the axion profile may be deformed; it is possible to construct a ``monopole bag" state composed of a central monopole within a closed axion domain wall. We consider the gravitational properties of this composite defect, and propose that there exist both a horizonless and a black hole-like static solution for different input parameters. For the latter case, we present our results as a first step towards a new construction of a dyonic regular black hole, given the monopole bag's potential ability to evade the usual singular gravitational collapse and retain a non-trivial axionic profile by the exotic electromagnetic properties of an axionic Chern-Simons term.

47 pages, 8 figures (version accepted by JHEP, some discussions added, no change to figures)