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.
Domain walls and strings formation in the early Universe
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Solitons formation through classical dynamics of two scalar fields with the potential having a saddle point and one minimum in (2+1)-space-time is discussed. We show that under certain conditions in the early Universe both domain walls and strings can be formed even if scalar fields are inflaton ones.
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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.