来自21-cm和紫外类星体吸收线的基本常数变动限制
天体物理学
2009-08-18 v3 高能物理 - 唯象学
原子物理
摘要
类星体21-cm和紫外波段吸收光谱用于估算x=alpha^2 g_p mu的时间变化，其中alpha为细结构常数，g_p为质子磁阻因子，mu为电子/质子质量比。对于红移范围0.24 ~< z_abs ~< 2.04的观测，<Delta x/x>_total_weighted=(1.17+-1.01) x 10^-5。线性拟合给出d/dt{x}/x=(-1.43+-1.27) x 10^-15 yr^-1。两项先前关于alpha变化的观测结果给出强大的mu/mu=(2.31+-1.03) x 10^-5和Delta mu/mu=(1.29+-1.01) x 10^-5的限制。我们的样本是任何先前样本的8倍，首次直接估算21-cm和UV速度差异约6 km s^-1的固有值。
引用
@article{arxiv.astro-ph/0412649,
title = {Limits on variations in fundamental constants from 21-cm and ultraviolet quasar absorption lines},
author = {P. Tzanavaris and J. K. Webb and M. T. Murphy and V. V. Flambaum and S. J. Curran},
journal= {arXiv preprint arXiv:astro-ph/0412649},
year = {2009}
}
备注
12 pages, 9 figures, accepted on 10 June 2005 for publication in Physical Review Letters. Results unchanged. Minor restructuring of abstract and one reference added. Pages 1-4 identical to accepted version following referees' comments. Pages 5-12 show plots to improve understanding of this work