Strong gravity effects of charged Q-clouds and inflating black holes

Abstract In this paper, we re-examine charged Q -clouds around spherically symmetric, static black holes. particular, demonstrate that for fixed coupling constants two different branches of scalar clouds exist Schwarzschild This had not been noticed previously. We find the new solutions possess a ‛hard wall’ at maximal possible gauge coupling. wall separates interior (containing hole horizon), in which field is trapped ‛false vacuum’, from ‛true vacuum’ exterior. When taking back-reaction onto space-time into account, back-reaction, corresponding to these either become extremal holes with diverging derivative on horizon or inflating second, ‛cosmological’ which—outside second horizon—correspond Reissner–Nordström