Long-term dynamics of cosmological axion strings

Kawasaki, Masahiro (ICRR, The University of Tokyo, Kashiwa, Chiba, Japan) (Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), WPI, UTIAS, The University of Tokyo, Kashiwa, Chiba, Japan) ; Sekiguchi, Toyokazu (Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo, Japan) ; Yamaguchi, Masahide (Department of Physics, Tokyo Institute of Technology, 2-12-1 Ookayama, Meguro-ku, Tokyo, Japan) ; Yokoyama, Jun’ichi (Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), WPI, UTIAS, The University of Tokyo, Kashiwa, Chiba, Japan) (Research Center for the Early Universe (RESCEU), Graduate School of Science, The University of Tokyo, Tokyo, Japan) (Department of Physics, Graduate School of Science, The University of Tokyo, Tokyo, Japan)

29 September 2018

Abstract: We present the results of a new field-theoretic simulation of cosmological axion strings, which are eight times longer than previous ones. We have upgraded our simulation of physical strings in Hiramatsu et al. [Phys. Rev. D 83 , 123531 (2011)] in terms of the number of grids as well as the suite of analyses. These improvements enable us to monitor a variety of quantities characterizing the dynamics of the physical string network for the longest term ever. Our extended simulations have revealed that global strings do not evolve according to the scaling solution, but that its scaling parameter, or the number of long strings per horizon, increases logarithmically in time. In addition, we have also found that the scaling parameter shows nontrivial dependence on the breaking scale of the Peccei–Quinn symmetry.


Published in: PTEP 2018 (2018) 091E01
Published by: Oxford University Press/Physical Society of Japan
DOI: 10.1093/ptep/pty098
arXiv: 1806.05566
License: CC-BY-3.0



Back to search

Fulltext:
Download fulltextPDF Download fulltextXML Download fulltextPDF (PDFA)