Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2005-11-29
Phys.Rev. D74 (2006) 063527
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
Added discussion of gravitational wave bounds; other minor changes
Scientific paper
10.1103/PhysRevD.74.063527
We study the spectrum of loops as a part of a complete network of cosmic strings in flat spacetime. After a long transient regime, characterized by production of small loops at the scale of the initial conditions, it appears that a true scaling regime takes over. In this final regime the characteristic length of loops scales as $0.1 t$, in contrast to earlier simulations which found tiny loops. We expect the expanding-universe behavior to be qualitatively similar. The large loop sizes have important cosmological implications. In particular, the nucleosynthesis bound becomes $G\mu \lesssim 10^{-7}$, much tighter than before.
Olum Ken D.
Vanchurin Vitaly
Vilenkin Alexander
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