Cosmic Strings - Dead Again?

Details Cosmic Strings - Dead Again? Cosmic Strings - Dead Again?

1998-06-24

arxiv.org/abs/hep-ph/9806469v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

Late appearance of talk given at Cosmo 97, Ambleside, England, Sept 97, based on hep-ph/9708427 (error concerning UHE cosmic r

Scientific paper

I report on recent numerical simulations of the simplest field theory with cosmic string solutions, the Abelian Higgs model. We find that random networks of string quickly converge to a scaling solution in which the network scale length $\xi$ increases linearly with time. There are very few loops with sizes less than $\xi$, and the strings are smooth, showing no signs of ``small scale structure''. We claim that particle production is the dominant energy-loss mechanism, not gravitational radiation as previously thought. For strings in Grand Unified Models, stringent constraints can be placed from cosmic ray observations on the string tension $\mu$: we estimate $G\mu < 10^{-9}$, three orders of magnitude lower than the constraint from Cosmic Microwave Background fluctuations.

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