2005/12/31 by Leonardo Campanelli, L. Campanelli, Maurizio Giannotti +1
Physics and Astronomy · #Cosmology and Gravitation Theories #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #astro-ph
paper · pdf · doi:10.1103/physrevlett.96.161302
published as Phys.Rev.Lett.96:161302,2006 · 4 pages, 2 figures, major changes in the first part of the paper, reference added, to be published in Phys. Rev. Lett
arxiv created 2006/04/05 · openalex publication_date 2006/04/26 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
We investigate the effects of an external magnetic helicity production on the evolution of the cosmic axion field. It is shown that a helicity larger than (few\ifmmode×\else\texttimes\fi10^\ensuremath-15 G)2 Mpc, if produced at temperatures above a few GeV, is in contradiction with the existence of the axion, since it would produce too much of an axion relic abundance.