Cosmological Magnetic Field: A Fossil of Density Perturbations in the Early Universe
Cosmological Magnetic Field: A Fossil of Density Perturbations in the Early Universe
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DOI：
10.1126/science.1120690
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发表时间：
2006-02
期刊：
影响因子：
56.9
通讯作者：
K. Ichiki;Keitaro Takahashi;H. Ohno;H. Hanayama;N. Sugiyama
中科院分区：
文献类型：
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作者：
K. Ichiki;Keitaro Takahashi;H. Ohno;H. Hanayama;N. Sugiyama
在星系和更大尺度上，如星系团中发现的大量磁场的起源还不清楚。如果考虑光子和电子之间的二阶耦合，那么解释宇宙大尺度结构的宇宙学密度涨落也可以在复合时代之前产生宇宙学尺度的磁场。通过评估这些宇宙学磁场在一系列尺度上的功率谱，我们在这里表明，10-18.1高斯的磁场是在1兆秒差距尺度上产生的，在更小的尺度上（10-14.1高斯，10千秒差距）可能会更强。这些磁场大到足以在星系中产生磁场，因此可能影响了早期宇宙中原始星星的形成。
The origin of the substantial magnetic fields that are found in galaxies and on even larger scales, such as in clusters of galaxies, is yet unclear. If the second-order couplings between photons and electrons are considered, then cosmological density fluctuations, which explain the large-scale structure of the universe, can also produce magnetic fields on cosmological scales before the epoch of recombination. By evaluating the power spectrum of these cosmological magnetic fields on a range of scales, we show here that magnetic fields of 10–18.1 gauss are generated at a 1-megaparsec scale and can be even stronger at smaller scales (10–14.1 gauss at 10 kiloparsecs). These fields are large enough to seed magnetic fields in galaxies and may therefore have affected primordial star formation in the early universe.