Revisiting formation of primordial black holes in a supercooled first-order phase transition

Abstract

We reexamine production of primordial black holes in a supercooled phase transition. While a mere overdensity associated with a surviving false-vacuum patch does not imply formation of a black hole, it is possible for such a patch to evolve and create a black hole, thanks to the gradient energy stored in the bubble wall.

12 pages, 3 figures;