On bubble collisions in strongly supercooled phase transitions
  We study strongly supercooled cosmological phase transitions. We perform
numerical lattice simulations of two-bubble collisions and demonstrate that,
depending on the scalar potential, in the collision the field can either bounce
to a false vacuum or remain oscillating around the true vacuum. We study if
these cases can be distinguished from their gravitational wave signals and
discuss the possibility of black hole formation in the bubble collisions.
