宇宙弦尾迹中的 Wouthuysen-Field 吸收谷
宇宙学与河外天体物理
2017-05-24 v2 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
宇宙弦尾迹中的重子密度增强导致这些弦尾迹内的自旋温度与气体动能温度的耦合强于星系际介质 (IGM) 中的耦合。Wouthuysen-Field (WF) 效应有潜力将这种耦合增强到如此程度,以至于可能在当前规划的射电望远镜项目中产生最强且最清晰的宇宙弦信号。在此,我们在假设 X 射线加热不显著的情况下考虑这种增强。我们表明,宇宙弦尾迹中这种效应的大小导致的亮度温度至少比周围 IGM 低两倍。如果 SCI-HI [1, 2] 或 EDGES [3, 4] 实验确认了宇宙气体中存在 WF 吸收谷,那么宇宙弦尾迹应在 z = 10 至 30 的 21 厘米红移巡天中清晰显现。
引用
@article{arxiv.1403.7522,
title = {The Wouthuysen Field Absorption Trough in Cosmic Strings Wakes},
author = {Oscar F. Hernandez},
journal= {arXiv preprint arXiv:1403.7522},
year = {2017}
}
备注
12 pages, 6 figures. v2: A new section was added that estimates the detectability of the signal. In the introduction the discussion on the motivation for and the limits on cosmic strings was expanded. Typos were corrected, references were added. The results remain unchanged. Accepted for publication in PRD