[HTML][HTML] Primordial black holes are true vacuum nurseries
The Hawking evaporation of primordial black holes (PBH) reheats the Universe locally,
forming hot spots that survive throughout their lifetime. We propose to use the temperature
profile of such hot spots to calculate the decay rate of metastable vacua in cosmology,
avoiding inconsistencies inherent to the Hartle-Hawking or Unruh vacuum. We apply our
formalism to the case of the electroweak vacuum stability and find that a PBH energy fraction
β> 7× 10− 80 (M/g) 3/2 is ruled out for black holes with masses 0.8 g< M< 10 15 g.
forming hot spots that survive throughout their lifetime. We propose to use the temperature
profile of such hot spots to calculate the decay rate of metastable vacua in cosmology,
avoiding inconsistencies inherent to the Hartle-Hawking or Unruh vacuum. We apply our
formalism to the case of the electroweak vacuum stability and find that a PBH energy fraction
β> 7× 10− 80 (M/g) 3/2 is ruled out for black holes with masses 0.8 g< M< 10 15 g.
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