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arXiv 1306.6227gr-qcastro-ph.CO
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闵可夫斯基空间中的引力电磁共振

Gravito-electromagnetic resonances in Minkowski space

Alexandros P. Kouretsis, Christos G. Tsagas

摘要:

我们考虑了在闵可夫斯基背景下传播的引力辐射和电磁辐射之间的相互作用,并研究了前者对后者的影响。毫不奇怪,这两个源之间的耦合导致引力驱动的电磁波。在第二微扰水平,驱动力表现为两个波的叠加,其性质由初始条件决定。我们发现,Weyl-Maxwell相互作用通常会导致电磁拍频信号,在某些情况下,驱动电磁波的谐振放大。对于物理上合理的初始条件,我们表明,这些共振意味着线性(在时间上)增长的电磁信号的振幅,与整体放大也取决于驱动重力波的强度。最后,我们通过将我们的分析应用于引力波和电磁波共存的天体物理环境,提供了所实现的放大的数量级估计。

英文摘要:

We consider the interaction between gravitational and electromagnetic radiation propagating on a Minkowski background and look into the effects of the former upon the latter. Not surprisingly, the coupling between these two sources leads to gravitationally driven electromagnetic waves. At the second perturbative level, the driving force appears as the superposition of two waves, the properties of which are decided by the initial conditions. We find that the Weyl-Maxwell interaction typically leads to electromagnetic beat-like signals and, in some cases, to the resonant amplification of the driven electromagnetic wave. For physically reasonable initial conditions, we show that these resonances imply a linear (in time) growth for the amplitude of the electromagnetic signal, with the overall amplification also depending on the strength of the driving gravity wave. Finally, we provide order-of-magnitude estimates of the achieved amplification by applying our analysis to astrophysical environments where both gravitational and electromagnetic waves are expected to coexist.

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