第一个磁场
The First Magnetic Fields
摘要：
我们回顾了目前关于银河系和河外磁场起源的观点。我们首先总结宇宙学红移和宇宙学尺度上的磁场观测。这些观测结果转化为对星系形成早期阶段磁场的强度和规模的限制，以便为星系发电机提供种子。我们研究的磁场，在通货膨胀和随后的相变，如电弱对称性破缺和夸克-强子相变的产生机制。详细讨论了强原始磁场对再电离时代以及第一代恒星的影响。奇异的早期宇宙机制与复合后产生场的天体物理过程形成对比。例如，比尔曼型电池可以在结构形成的早期阶段在原星系中运行。此外，早期恒星或活动星系核中的磁场可以分散到星系际介质中。
英文摘要：
We review current ideas on the origin of galactic and extragalactic magnetic fields. We begin by summarizing observations of magnetic fields at cosmological redshifts and on cosmological scales. These observations translate into constraints on the strength and scale magnetic fields must have during the early stages of galaxy formation in order to seed the galactic dynamo. We examine mechanisms for the generation of magnetic fields that operate prior during inflation and during subsequent phase transitions such as electroweak symmetry breaking and the quark-hadron phase transition. The implications of strong primordial magnetic fields for the reionization epoch as well as the first generation of stars is discussed in detail. The exotic, early-Universe mechanisms are contrasted with astrophysical processes that generate fields after recombination. For example, a Biermann-type battery can operate in a proto-galaxy during the early stages of structure formation. Moreover, magnetic fields in either an early generation of stars or active galactic nuclei can be dispersed into the intergalactic medium.
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