Post-inflationary quantum fluctuations of two scalar fields can form a three-dimensional soliton foam of closed domain walls, string-bounded walls, and scalar radiation, without a thermal phase transition.
Dynamical Evolution of Domain Walls in an Expanding Universe
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Soliton foam formation in the early Universe
Post-inflationary quantum fluctuations of two scalar fields can form a three-dimensional soliton foam of closed domain walls, string-bounded walls, and scalar radiation, without a thermal phase transition.