Large Scale Magnetogenesis Through Radiation Pressure
Large Scale Magnetogenesis Through Radiation Pressure
复制标题
通过辐射压力大规模磁化
DOI：
10.5303/jkas.2004.37.5.553
复制
发表时间：
2004
影响因子：
1
通讯作者：
N. Aghanim
中科院分区：
文献类型：
--
作者：
M. Langer;J. Puget;N. Aghanim
我们提出了宇宙再电离结束时大尺度磁场产生的新模型。光源提供的非均匀辐射和物质密度场的波动是模型的主要组成部分。更具体地说，作用于离子和电子的不同辐射压力产生电流，从而在大范围内产生磁场。我们表明，在原星系尺度上，这个过程是非常有效的，导致磁场振幅达到高斯数量级。尽管动力学影响仍然可以忽略不计，但这些振幅比通常的天体物理磁发生模型所获得的振幅高数百万倍。最后，导出了产生场的功率谱与物质密度波动谱之间的关系。我们特别指出，磁场最好是在大尺度（星系或星系团）上产生的。小尺度磁场是非常不利的，这进一步使我们提出的过程成为解释大尺度结构中磁场起源的理想候选者。
We present a new model for the generation of magnetic fields on large scales occurring at the end of cosmological reionisation. The inhomogeneous radiation provided by luminous sources and the fluctuations in the matter density field are the major ingredients of the model. More specifically, differential radiation pressure acting on ions and electrons gives rise to electric currents which induce magnetic fields on large scales. We show that on protogalactic scales, this process is highly efficient, leading to magnetic field amplitudes of the order of Gauss. While remaining of negligible dynamical impact, those amplitudes are million times higher than those obtained in usual astrophysical magnetogenesis models. Finally, we derive the relation between the power spectrum of the generated field and the one of the matter density fluctuations. We show in particular that magnetic fields are preferably created on large (galactic or cluster) scales. Small scale magnetic fields are strongly disfavoured, which further makes the process we propose an ideal candidate to explain the origin of magnetic fields in large scale structures.
DOI：
--
发表时间：
2004
期刊：
Journal of the Korean Astronomical Society 37・5
影响因子：
--
作者：
N.Okabe;M.Hattori
通讯作者：
M.Hattori
影响因子：
8.7
作者：
Bennett, CL;Halpern, M;Weiland, JL
通讯作者：
Weiland, JL