Large-scale magnetic fields from inflation in dilaton electromagnetism
Large-scale magnetic fields from inflation in dilaton electromagnetism
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DOI：
10.1103/physrevd.69.043507
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发表时间：
2003-10
影响因子：
5
通讯作者：
K. Bamba;Jun'ichi Yokoyama
中科院分区：
文献类型：
--
作者：
K. Bamba;Jun'ichi Yokoyama
大尺度磁场的产生是在暴胀宇宙学中的介子电磁学中研究的，考虑到介子在暴胀和再加热过程中的演化，直到它稳定下来并可能产生熵。结果表明，如果通过介子与电磁场之间的耦合打破麦克斯韦理论的共形不变性，使得磁场中的量子涨落具有近似标度不变的谱，则可以产生具有目前观测上感兴趣强度的大尺度磁场.如果满足这个条件，即使在随着介子衰变而产生大量熵的情况下，所产生的磁场的幅度也可以足够大。
The generation of large-scale magnetic fields is studied in dilaton electromagnetism in inflationary cosmology, taking into account the dilaton's evolution throughout inflation and reheating until it is stabilized with possible entropy production. It is shown that large-scale magnetic fields with observationally interesting strength at the present time could be generated if the conformal invariance of the Maxwell theory is broken through the coupling between the dilaton and electromagnetic fields in such a way that the resultant quantum fluctuations in the magnetic field has a nearly scale-invariant spectrum. If this condition is met, the amplitude of the generated magnetic field could be sufficiently large even in the case huge amount of entropy is produced with the dilution factor $\sim 10^{24}$ as the dilaton decays.