Evolution of String-Wall Networks and Axionic Domain Wall Problem

Details Evolution of String-Wall Networks and Axionic Domain Wall Problem Evolution of String-Wall Networks and Axionic Domain Wall Problem

2010-12-21

arxiv.org/abs/1012.4558v3

JCAP 1108:030,2011

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

19 pages, 7 figures; revised version of the manuscript, accepted for publication in JCAP

Scientific paper

10.1088/1475-7516/2011/08/030

We study the cosmological evolution of domain walls bounded by strings which arise naturally in axion models. If we introduce a bias in the potential, walls become metastable and finally disappear. We perform two dimensional lattice simulations of domain wall networks and estimate the decay rate of domain walls. By using the numerical results, we give a constraint for the bias parameter and the Peccei-Quinn scale. We also discuss the possibility to probe axion models by direct detection of gravitational waves produced by domain walls.

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