Cosmic Structure Formation with Topological Defects

Details Cosmic Structure Formation with Topological Defects Cosmic Structure Formation with Topological Defects

2001-10-16

arxiv.org/abs/astro-ph/0110348v2

Phys.Rept.364:1-81,2002

Astronomy and Astrophysics

Astrophysics

Review for Physics Reports, 133 pages 29 figures. Updated to match published version. Better quality and color figures are ava

Scientific paper

10.1016/S0370-1573(02)00014-5

Topological defects are ubiquitous in physics. Whenever a symmetry breaking phase transition occurs, topological defects may form. The best known examples are vortex lines in type II super conductors or in liquid Helium, and declination lines in liquid crystals. In an adiabatically expanding universe which cools down from a very hot initial state, it is quite natural to postulate that topological defects may have emerged during a phase transition in the early universe and that they may have played the role of initial inhomogeneities seeding the formation of cosmic structure. This basic idea goes back to Kibble (1976). In this report we summarize the progress made in the investigation of Kibble's idea during the last 25 years. Our understanding of the formation and evolution of topological defects is reported almost completely in the beautiful book by Vilenkin & Shellard or the excellent Review by Hindmarsh & Kibble, and we shall hence be rather short on that topic. Nevertheless, in order to be self contained, we have included a short chapter on spontaneous symmetry breaking and defect formation. Our main topic is however the calculation of structure formation with defects, results which are not included in the above references.

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