Improved estimation of radiated axions from cosmological axionic strings
High Energy Physics - Phenomenology
2011-06-30 v2 Cosmology and Nongalactic Astrophysics
General Relativity and Quantum Cosmology
High Energy Physics - Theory
Abstract
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*10^11 GeV. We also discuss implications for the early Universe.
Keywords
Cite
@article{arxiv.1012.5502,
title = {Improved estimation of radiated axions from cosmological axionic strings},
author = {Takashi Hiramatsu and Masahiro Kawasaki and Toyokazu Sekiguchi and Masahide Yamaguchi and Jun'ichi Yokoyama},
journal= {arXiv preprint arXiv:1012.5502},
year = {2011}
}
Comments
24 pages, 7 figures