Constraints on the primordial magnetic field from σ8

被引：26

作者：

Yamazaki, Dai G. ^{[1
]}

Ichiki, Kiyotomo ^{[2
]}

Kajino, Toshitaka ^{[1
,3
]}

Mathews, Grant J. ^{[4
]}

机构：

[1] Natl Astron Observ, Mitaka, Tokyo 1818588, Japan

[2] Univ Tokyo, Sch Sci, Res Ctr Early Universe, Bunkyo Ku, Tokyo 1130033, Japan

[3] Univ Tokyo, Sch Sci, Dept Astron, Bunkyo Ku, Tokyo 1130033, Japan

[4] Univ Notre Dame, Dept Phys, Ctr Astrophys, Notre Dame, IN 46556 USA

来源：

PHYSICAL REVIEW D | 2008年 / 78卷 / 12期

关键词：

D O I：

10.1103/PhysRevD.78.123001

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

A primordial magnetic field (PMF) can affect the evolution of density-field fluctuations in the early universe. In this paper we constrain the PMF amplitude B-lambda and power spectral index n(B) by comparing calculated density-field fluctuations with observational data, i.e. the number density fluctuation of galaxies. We show that the observational constraints on cosmological density fluctuations, as parametrized by sigma(8), lead to strong constraints on the amplitude and spectral index of the PMF.

引用

页数：9