Large-scale magnetic fields from density perturbations

被引：84
|
作者：
Matarrese, S
Mollerach, S
Notari, A
Riotto, A
机构：
[1] Univ Padua, Dipartimento Fis G Galilei, I-35131 Padua, Italy
[2] Ist Nazl Fis Nucl, Sez Padova, I-35131 Padua, Italy
[3] Ctr Atom Bariloche, CONICET, RA-8400 San Carlos De Bariloche, Rio Negro, Argentina
[4] Scuola Normale Super Pisa, I-56126 Pisa, Italy
[5] Ist Nazl Fis Nucl, Pisa, Italy
[6] McGill Univ, Dept Phys, Montreal, PQ H3A 2T8, Canada
来源：
PHYSICAL REVIEW D | 2005年 / 71卷 / 04期
关键词：
D O I：
10.1103/PhysRevD.71.043502
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
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 nonlinear 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 Bapproximate to10(-23)(lambda/Mpc)(-2) G, on comoving scales lambdagreater than or similar to1 Mpc.
引用
收藏
页码：043502 / 1
页数：7
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