GENERATION OF MAGNETIC FIELDS IN COSMOLOGICAL SHOCKS
GENERATION OF MAGNETIC FIELDS IN COSMOLOGICAL SHOCKS
复制标题
宇宙冲击中磁场的产生
DOI：
10.5303/jkas.2004.37.5.533
复制
发表时间：
2004
影响因子：
1
通讯作者：
W. Mori
中科院分区：
文献类型：
--
作者：
M. Medvedev;Luís O. Silva;M. Fiore;R. Fonseca;W. Mori
宇宙中磁场的起源一直是宇宙学中一个悬而未决的问题。我们认为这些场是由大尺度构造形成过程中的冲击所产生的。我们讨论了通过逆流（韦伯）不稳定性的字段生成的机制。我们还表明，这些韦伯产生的字段是长寿命和弱耦合耗散。随后的磁场放大的集群内的湍流也可能发生，从而保持磁能密度接近均分。
The origin of magnetic fields in the universe remains an outstanding problem in cosmology. We propose that these fields are produced by shocks during the large-scale structure formation. We discuss the mechanism of the field generation via the counter-streaming (Weibel) instability. We also show that these Weibel-generated fields are long-lived and weakly coupled to dissipation. Subsequent field amplification by the intra-cluster turbulence may also take place, thus maintaining the magnetic energy density close to equipartition.