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arXiv 1305.7151astro-ph.COhep-phhep-th
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没有强耦合问题的暴胀磁生

Inflationary Magnetogenesis without the Strong Coupling Problem

Ricardo J. Z. Ferreira, Rajeev Kumar Jain, Martin S. Sloth

摘要:

已知最简单的暴胀磁生的规范不变模型会受到大的反作用或强耦合的问题的困扰,这使得它很难自洽地从暴胀中获得比$\Mpc$尺度上的$10^{-32} G$更大的宇宙磁场。这样的强度不足以作为银河发电机效应的种子,这需要一个大于$10^{-20} G$的磁场。在本文中,我们分析了简单的扩展的极小模型,它避免了强耦合和反反应的问题,以产生足够大的磁场的Mpc规模的今天。首先研究了破坏电磁共形不变性的耦合函数是具有尖锐特征的非单调函数的可能性。随后,我们考虑的影响,降低能量标度的通货膨胀与长期再加热的情况下,宇宙是由一个僵硬的流体膨胀后很短的时间内占主导地位。在后一种情况下,一个系统的研究表明,磁场强度的上限今天的Mpc规模的$10^{-13} G$的低规模的通货膨胀和$10^{-25} G$的高规模的通货膨胀,从而提高了7-19个数量级的先前的结果。这些结果与强耦合和反作用约束是一致的。

英文摘要:

The simplest gauge invariant models of inflationary magnetogenesis are known to suffer from the problems of either large backreaction or strong coupling, which make it difficult to self-consistently achieve cosmic magnetic fields from inflation with a field strength larger than $10^{-32} G$ today on the $\Mpc$ scale. Such a strength is insufficient to act as seed for the galactic dynamo effect, which requires a magnetic field larger than $10^{-20} G$. In this paper we analyze simple extensions of the minimal model, which avoid both the strong coupling and back reaction problems, in order to generate sufficiently large magnetic fields on the Mpc scale today. First we study the possibility that the coupling function which breaks the conformal invariance of electromagnetism is non-monotonic with sharp features. Subsequently, we consider the effect of lowering the energy scale of inflation jointly with a scenario of prolonged reheating where the universe is dominated by a stiff fluid for a short period after inflation. In the latter case, a systematic study shows upper bounds for the magnetic field strength today on the Mpc scale of $10^{-13} G$ for low scale inflation and $10^{-25} G$ for high scale inflation, thus improving on the previous result by 7-19 orders of magnitude. These results are consistent with the strong coupling and back reaction constraints.

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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