Cosmological magnetogenesis driven by radiation pressure
Cosmological magnetogenesis driven by radiation pressure
复制标题
辐射压驱动的宇宙磁生作用
DOI：
10.1103/physrevd.67.043505
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发表时间：
2002
影响因子：
5
通讯作者：
N. Aghanim
中科院分区：
文献类型：
--
作者：
M. Langer;J. Puget;N. Aghanim
大尺度宇宙磁场的起源仍然是一个谜，尽管人们一直在努力解决这个问题。我们提出了一个新的模型的磁场产生，基于各向异性和不均匀的辐射压力提供的局部电荷分离。在宇宙学的背景下，我们探索的过程发生在宇宙再电离的时代。在简单的假设下，我们得到的结果（i）在大尺度上产生的场的数量级和（ii）在其功率谱方面。获得的振幅$（B\ensuremath{\sim}8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}\ensuremath{\mu}\mathrm{G}）$比通常的磁成因模型中获得的振幅高得多，并为在结构形成期间通过绝热塌缩和/或发电机进行放大提供了合适的种子。
The origin of large scale cosmological magnetic fields remains a mystery, despite the continuous efforts devoted to that problem. We present a new model of magnetic field generation, based on local charge separation provided by an anisotropic and inhomogeneous radiation pressure. In the cosmological context, the processes we explore take place at the epoch of the reionization of the Universe. Under simple assumptions, we obtain results (i) in terms of the order of magnitude of the field generated at large scales and (ii) in terms of its power spectrum. The amplitudes obtained $(B\ensuremath{\sim}8\ifmmode\times\else\texttimes\fi{}{10}^{\ensuremath{-}6}\ensuremath{\mu}\mathrm{G})$ are considerably higher than those obtained in usual magnetogenesis models and provide suitable seeds for amplification by adiabatic collapse and/or dynamo during structure formation.