Large-scale magnetic fields from density perturbations
天体物理学
2009-11-10 v1 广义相对论与量子宇宙学
高能物理 - 唯象学
高能物理 - 理论
摘要
We derive the minimal seed magnetic field which unavoidably arises in the radiation and matter eras, prior to recombination, by the rotational velocity of ions and electrons, gravitationally induced by the non-linear evolution of primordial density perturbations. The resulting magnetic field power-spectrum is fully determined by the amplitude and spectral index of density perturbations. The rms amplitude of the seed-field at recombination is B ~ 10^{-23} (\lambda/Mpc)^{-2} G, on comoving scales larger than about 1 Mpc.
引用
@article{arxiv.astro-ph/0410687,
title = {Large-scale magnetic fields from density perturbations},
author = {S. Matarrese and S. Mollerach and A. Notari and A. Riotto},
journal= {arXiv preprint arXiv:astro-ph/0410687},
year = {2009}
}
备注
7 pages, 1 figure