Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1994-04-05
Nucl.Phys. B434 (1995) 675-696
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 4 figures, OUTP-93-22P, CERN-TH-6995/93, TUM-TH-159/93
Scientific paper
10.1016/0550-3213(94)00557-U
We give an analytical description of the spatial distribution of domain walls produced during a biased nonequilibrium phase transition in the vacuum state of a light scalar field. We discuss in detail the spectrum of the associated cosmological energy density perturbations. It is shown that the contribution coming from domain walls can enhance the standard cold dark matter spectrum in such a way as to account for the whole range of IRAS data and for the COBE measurement of the microwave background anisotropy. We also demonstrate that in case of a biased phase transition which allows a percolative description, the number of large size domain walls is strongly suppressed. This offers a way of avoiding excessive microwave background distorsions due to the gravitational field of domain walls present after decoupling.
Lalak Zygmunt
Lola Smaragda
Ovrut Burt A.
Ross Graham G.
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