Cosmological evolution of monopoles connected by strings

Physics – Nuclear Physics

Scientific paper

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Scientific paper

Phase transitions in the early universe can give rise to a system of vacuum strings. Assuming that the strings are topologically stable, it has been recently shown that they can produce density fluctuations which can subsequently lead to galaxy formation. The present paper examines the cosmological evolution of topologically unstable strings. In this case the system consists of strings having monopoles and antimonopoles at the ends, as well as of closed loops. Various physical processes in the system are discussed in detail. It is shown that monopoles and strings disappear long before any appreciable density fluctuations on a galactic scale can be produced.

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