Evolution of string-wall networks and axionic domain wall problem

Journal Article · Mon Aug 01 04:00:00 EDT 2011 · Journal of Cosmology and Astroparticle Physics

DOI:https://doi.org/10.1088/1475-7516/2011/08/030· OSTI ID:22277714

Hiramatsu, Takashi ^[1]; Kawasaki, Masahiro; Saikawa, Ken'ichi ^[2]

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1. Yukawa Institute for Theoretical Physics, Kyoto University, Kitashirakawa Oiwake-cho, Sakyo-ku, Kyoto 606-8502 (Japan)
2. Institute for Cosmic Ray Research, The University of Tokyo, 5-1-5 Kashiwa-no-ha, Kashiwa City, Chiba 277-8582 (Japan)

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.

• OSTI ID: 22277714
• Journal Information: Journal of Cosmology and Astroparticle Physics, Journal Name: Journal of Cosmology and Astroparticle Physics Journal Issue: 08 Vol. 2011; ISSN 1475-7516
• Country of Publication: United States
• Language: English

Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
AXIONS
COMPUTERIZED SIMULATION
COSMOLOGICAL MODELS
COSMOLOGY
EVOLUTION
GRAVITATIONAL WAVES
LATTICE FIELD THEORY
POTENTIALS
STRING MODELS
TWO-DIMENSIONAL CALCULATIONS