Evolution of domain walls in the early universe

Details Evolution of domain walls in the early universe Evolution of domain walls in the early universe

Oct 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989phdt.........2k&link_type=abstract

Ph.D. Thesis - Chicago Univ. Fermi National Accelerator Lab., Batavia, IL. Astrophysics Center.

Physics

1

Computerized Simulation, Cosmology, Domain Wall, String Theory, Universe, Broken Symmetry, Theoretical Physics, Vacuum

Scientific paper

The evolution of domain walls in the early universe is studied via 2-D computer simulation. The walls are initially configured on a triangular lattice and then released from the lattice, their evolution driven by wall curvature and by the universal expansion. The walls attain an average velocity of about 0.3c and their surface area per volume (as measured in comoving coordinates) goes down with a slope of -1 with respect to conformal time, regardless of whether the universe is matter or radiation dominated. The additional influence of vacuum pressure causes the energy density to fall away from this slope and steepen, thus allowing a situation in which domain walls can constitute a significant portion of the energy density of the universe without provoking an unacceptably large perturbation upon the microwave background.

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