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arXiv 2209.03545astro-ph.CO
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多矢量场驱动的原初磁场暴胀磁生成

Inflationary magnetogenesis of primordial magnetic fields with multiple vector fields

Yu Li, Le-Yao Zhang

AI总结:

本文研究暴胀时期多矢量场的磁生成机制,通过引入耦合矩阵替代单一耦合函数,分析双场模型中无耦合、弱耦合和强耦合三种情形,发现无耦合和强耦合均可实现尺度不变磁场谱,但强耦合会带来反作用或稀释问题。

摘要:

本文讨论了暴胀时期的多矢量场以及利用多矢量场实现的暴胀磁生成。与单矢量场模型中采用单一耦合函数不同,本文引入了驱动暴胀的矢量场与标量场之间的耦合矩阵。我们得到了多矢量场的动力学方程,并将其应用于暴胀时期。针对双场模型,我们讨论了三种情形。在无相互耦合的情形下,可以发现暴胀结束时电场谱和磁场谱都可以是尺度不变的,同时可以避免强耦合问题。本文还讨论了不同矢量场之间相互耦合的影响。我们发现弱相互耦合可以导致磁场谱略微偏蓝。另一方面,在强相互耦合情形下,虽然也可以得到尺度不变的磁场谱,但电磁场的能量密度要么会导致反作用问题,要么会被暴胀稀释。

英文摘要:

In this paper, we discussed the multiple vector fields during the inflation era and the inflationary magnetogenesis with multiple vector fields. Instead of a single coupling function in single vector field models, the coupling matrix between vector fields and scalar field which drive the inflation is introduced. The dynamical equations for multiple vector fields are obtained and applied to the inflation era. We discussed three cases for the double-field model. In no mutual-coupling case, one can find that both electric and magnetic spectrum can be scale-invariant at the end of inflation, meanwhile, the strong coupling problem can be avoided. The effect of mutual-coupling between different vector fields is also discussed. We found that weak mutual-coupling can lead to the slightly blue spectrum of the magnetic field. On the other hand, in the strong mutual-coupling case, the scale-invariant magnetic spectrum can also be obtained but the energy density of electromagnetic fields either lead to the backreaction problem or is diluted by inflation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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