Black-hole bubbles

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Abstract
If theories of high-energy physics such as spontaneous symmetry breaking and quantum chromodynamics are correct, then exploding black holes will be surrounded by phase-transition bubbles or fireballs, supported by the pressure of particles trapped inside a high-temperature phase. For quark-gas fireballs, where there is a hadron bag with a hole in it, this enhances the γ-ray emission by a factor of 69 which could lead to a feature in the γ-ray background around 200 MeV. For other bubbles there may be detectable electromagnetic pulses produced by the Rees mechanism when the bubble bursts, particularly for the inflated bubbles which result from the models suggested by the inflationary-universe scenario.

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