Evolution of Axionic Strings and Spectrum of Axions Radiated from Them
High Energy Physics - Phenomenology
2009-10-31 v2 Astrophysics
Abstract
Cosmological evolution of axionic strings is investigated by numerically solving field equations of a complex scalar field in 3+1 dimensions. It is shown that the global strings relax to the scaling solution with a significantly smaller number density than the case of local strings. The power spectrum of axions radiated from them is calculated from the simulation data, which is found to be highly peaked around the Hubble scale, and a more accurate constraint on the Peccei-Quinn breaking scale is obtained.
Cite
@article{arxiv.hep-ph/9811311,
title = {Evolution of Axionic Strings and Spectrum of Axions Radiated from Them},
author = {Masahide Yamaguchi and M. Kawasaki and Jun'ichi Yokoyama},
journal= {arXiv preprint arXiv:hep-ph/9811311},
year = {2009}
}
Comments
Some typos and statements are corrected; to appear in Phys. Rev. Lett