Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 8, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2011/08/030
Keywords
axions; physics of the early universe; Cosmic strings; domain walls; monopoles
Funding
- Ministry of Education, Science, Sports, and Culture (MEXT), Japan [14102004, 21111006]
- World Premier International Research Center Initiative (WPI Initiative)
- Japan Society for the Promotion of Science (JSPS) [21244033]
- Grants-in-Aid for Scientific Research [22540267, 21111006, 11J04306] Funding Source: KAKEN
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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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