Journal
PHYSICAL REVIEW D
Volume 83, Issue 12, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevD.83.123531
Keywords
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Funding
- JSPS [19340054, 2111006, 21244033, 21740187]
- World Premier International Research Center Initiative (WPI Initiative), MEXT, Japan
- [21111006]
- Grants-in-Aid for Scientific Research [22540267, 21740187] Funding Source: KAKEN
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Cosmological evolution of axionic string network is analyzed in terms of field-theoretic simulations in a box of 512(3) grids, which are the largest ever, using a new and more efficient identification scheme of global strings. The scaling parameter is found to be xi = 0.87 +/- 0.14 in agreement with previous results. The energy spectrum is calculated precisely using a pseudo power spectrum estimator which significantly reduces the error in the mean reciprocal comoving momentum. The resultant constraint on the axion decay constant leads to f(a) <= 3 x 10(11) GeV. We also discuss implications for the early Universe.
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