For spatial volumes below a critical value in D compact dimensions, a new bounce distinct from Coleman's O(D) bubble mediates false vacuum decay, yielding homogeneous configurations and enhanced rates.
Black Holes from Nucleating Strings
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abstract
We evaluate the probability that a loop of string that has spontaneously nucleated during inflation will form a black hole upon collapse, after the end of inflation. We then use the observational bounds on the density of primordial black holes to put constraints on the parameters of the model. Other constraints from the distortions of the microwave background and emission of gravitational radiation by the loops are considered. Also, observational constraints on domain wall nucleation and monopole pair production during inflation are briefly discussed.
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Bulk viscosity raises the critical collapse threshold for primordial black holes by an amount comparable to the viscosity strength and increases the resulting black hole masses.
citing papers explorer
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Compact space catalysis of false vacuum decay and Schwinger effect
For spatial volumes below a critical value in D compact dimensions, a new bounce distinct from Coleman's O(D) bubble mediates false vacuum decay, yielding homogeneous configurations and enhanced rates.
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Primordial black hole formation in bulk-viscous cosmology
Bulk viscosity raises the critical collapse threshold for primordial black holes by an amount comparable to the viscosity strength and increases the resulting black hole masses.