On the evolution of global strings in the early universe

Details On the evolution of global strings in the early universe On the evolution of global strings in the early universe

Sep 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phlb..195..361h&link_type=abstract

Physics Letters B, Volume 195, Issue 3, p. 361-365.

Physics

107

Scientific paper

We find that a bent global string straightens itself out by dissipation into Nambu-Goldstone (NG) bosons in the order of one oscillation time and that the spectrum of radiated NG bosons is 1/k. In the early universe, the assumption that there is one global string per causal horizon is justified after an initial period during which the effect of the primordial plasma on the motion of the strings is non-negligible. We find that the upper bound that axion radiation by strings places on the axion decay constant is comparable to, but not more stringent than the one derived from coherent oscillations of the axion field, i.e. ∫a <~ 1012GeV. We also discuss the model-dependence of this bound.

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