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arXiv 0810.1324physics.plasm-ph
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电阻对等离子体中电磁波的传播与因果相对论磁流体力学

Propagation of Electromagnetic Waves in Resistive Pair Plasma and Causal Relativistic Magnetohydrodynamics

Shinji Koide

摘要:

本文从相对论性双流体方程出发,采用单流体理论研究了电磁波在电阻对等离子体中的传播。当用电子/正电子惯性变量归一化的电阻率超过一个临界值时,电磁波的色散关系表明真空中的群速度大于光速。然而,在这种情况下,也发现等离子体参数小于1:即,电子-正电子对介质不再可以被视为等离子体。因此,简单的双流体近似是无效的。这证实了电磁波在等离子体中的超光速传播是被禁止的--这一结论与相对论因果律是一致的。作为替代方案,我们提出了一套新的方程的“因果相对论磁流体力学”,这两个非零电阻率,但符合因果关系的原则。

英文摘要:

We investigate the propagation of electromagnetic waves in resistive pair plasmas using a onefluid theory derived from the relativistic two-fluid equations. When the resistivity normalized by the electron/positron inertia variable exceeds a critical value, the dispersion relation for electromagnetic waves shows that the group velocity is larger than the light speed in vacuum. However, in such a case, it also is found that the plasma parameter is less than unity: that is, the electron-positron pair medium no longer can be treated as plasma. Thus the simple two-fluid approximation is invalid. This confirms that superluminal propagation of electromagnetic wave is forbidden in a plasma -- a conclusion consistent with the relativistic principle of causality. As an alternative, we propose a new set of equations for ``causal relativistic magnetohydrodynamics", which both have non-zero resistivity and yet are consistent with the causality principle.

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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