On possible scenario of relic wormhole formation

It is known that in the presence of Euclidean wormholes the vacuum state is unstable, which, in general, leads to a number of phase transitions in the early Universe. According to the Kibble scenario during the phase transitions, defects of the domain-wall-type were formed. The specific feature of Euclidean wormholes is that a part of defects possesses negative energy and violates the energy conditions. The macroscopic character of such defects allows already the formation of a stable Lorentzian wormhole. This gives reason to consider relic wormholes as realistic astrophysical objects.