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arXiv 0708.2690gr-qcastro-ph
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Schwarzschild黑洞视界对等离子体波色散的影响

Effects of Schwarzschild Black Hole Horizon on Isothermal Plasma Wave Dispersion

M. Sharif, Umber Sheikh

摘要:

在等离子体处于等温状态下,建立了Rindler坐标系下Schwarzschild时空的3+1 GRMHD方程。我们考虑的情况下,非旋转和旋转的背景与非磁化和磁化等离子体。对于这些情况下,这些方程的扰动形式的线性化和傅立叶分析,通过引入平面波型的解决方案。在每种情况下,这些方程的行列式导致两个色散关系,给出波数$k$的值。利用波数可以得到相速度和群速度等信息,这些信息有助于讨论波的性质和特征。这些提供了关于视界附近的黑洞磁层的有趣信息。有正常和异常色散的情况。当等离子体具有Veselago介质的性质时,我们发现了波的正常色散。我们的结果与Mackay等人关于负相速度传播需要黑洞旋转的观点一致。

英文摘要:

The 3+1 GRMHD equations for Schwarzschild spacetime in Rindler coordinates with isothermal state of plasma are formulated. We consider the cases of non-rotating and rotating backgrounds with non-magnetized and magnetized plasmas. For these cases, the perturbed form of these equations are linearized and Fourier analyzed by introducing plane wave type solutions. The determinant of these equations in each case leads to two dispersion relations which give value of the wave number $k$. Using the wave number, we obtain information like phase and group velocities etc. which help to discuss the nature of the waves and their characteristics. These provide interesting information about the black hole magnetosphere near the horizon. There are cases of normal and anomalous dispersion. We find a case of normal dispersion of waves when the plasma admits the properties of Veselago medium. Our results agree with those of Mackay et al. according to which rotation of a black hole is required for negative phase velocity propagation.

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