Journal
JOURNAL OF COSMOLOGY AND ASTROPARTICLE PHYSICS
Volume -, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1475-7516/2014/02/031
Keywords
primordial gravitational waves (theory) physics of the early universe; cosmological phase transitions; Cosmic strings; domain walls; monopoles
Funding
- Ministry of Education, Science, Sports, and Culture (MEXT), Japan [25100218, 21111006]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- Japan Society for the Promotion of Science (JSPS)
- JSPS [23740186]
- MEXT HPCI Strategic Program
- Grants-in-Aid for Scientific Research [23740186, 13J03160, 21111006] Funding Source: KAKEN
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We revisit the production of gravitational waves from unstable domain walls analyzing their spectrum by the use of field theoretic lattice simulations with grid size 10243, which is larger than the previous study. We have recognized that there exists an error in the code used in the previous study, and the correction of the error leads to the suppression of the spectrum of gravitational waves at high frequencies. The peak of the spectrum is located at the scale corresponding to the Hubble radius at the time of the decay of domain walls, and its amplitude is consistent with the naive estimation based On the quadrupole formula. Using the numerical results, the magnitude and the peak frequency of gravitational waves at the present time are estimated. It is shown that for some choices of parameters the signal of gravitational waves is strong enough to be probed in the future gravitational wave experiments.
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