domain wall

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A hypothetical two-dimensional defect in the structure of spacetime, produced in some models of the early Universe. In essence, it is a wall-like structure in which energy is trapped. A theory of particle physics that predicts large numbers of domain walls would also predict a highly inhomogeneous Universe, contrary to observations. See also Cosmic String; Cosmic Texture; Magnetic Monopole.

Subjects: Astronomy and Astrophysics.

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