Annu. Rev. Astron. Astrophys. 1991. 29: 325-362
Copyright © 1991 by . All rights reserved

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2.2.4. DOMAIN WALLS The GUTs phase transition produces certain characteristic discontinuities in the matter distribution. This happens during the spontaneous breakdown of symmetry, which leads the mediating scalar fields to have a discrete set of characteristic values. Thus one region or ``domain'' has one value of the scalar field, while its neighbor has another. The boundary wall between the domains would therefore be a region of discontinuity. We expect to see this as a sheet of inhomogeneity in the large scale matter distribution in the universe. The present data do not reveal any such inhomogeneity in the observable universe.