Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 5, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2010/05/032
Keywords
gravitational waves / sources; physics of the early universe; cosmological phase transitions; 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)
- Grants-in-Aid for Scientific Research [22540267] Funding Source: KAKEN
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We study the production of gravitational waves from cosmic domain walls created during phase transition in the early universe. We investigate the process of formation and evolution of domain walls by running three dimensional lattice simulations. If we introduce an approximate discrete symmetry, walls become metastable and finally disappear. This process might occur by a pressure difference between two vacua if a quantum tunneling is neglected. We calculate the spectrum of gravitational waves produced by collapsing metastable domain walls. Extrapolating the numerical results, we find that the signal of gravitational waves produced by domain walls whose energy scale is around 10(10)-10(12)GeV will be observable in the next generation gravitational wave interferometers.
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