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Infrared state of the negative-viscosity plasma

机译：负粘度等离子体的红外状态

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摘要

Recent studies of the generation of large-scale fluctuations by the drift-Alfven modes or by the drift-tearing modes adopt the negative-viscosity plasmas that model the effect of small-scale turbulence. With the turbulence assumed to be a Gaussian random noise of power-law spectrum, the renormalization-group method is applied in order to explore the large-scale dynamics of the noise-driven magnetohydrodynamic plasma with negative viscosity in the long-time limit. The viscosity, the resistivity, the magnetic field and the strength of the noise are renormalized by regularizing the divergent response functions, the noise and the couplings. The ratio of the resistivity to the viscosity and the strength of the noise are obtained. Based on the anomalous dimensions of the velocity and the magnetic field, it is shown that the kinetic energy spectrum is steeper than the magnetic energy due to the renormalization of the Lorentz force, which is opposite to the case of positive viscosity.
机译：通过漂移-Alfven模式或漂移-撕裂模式产生大规模波动的最新研究采用负粘度等离子体模拟了小规模湍流的影响。在湍流假定为幂律谱的高斯随机噪声的情况下，应用重归一化组方法来研究具有负粘度的噪声驱动的磁流体动力学等离子体的长期动力学。通过调整发散的响应函数，噪声和耦合，可以重新标准化粘度，电阻率，磁场和噪声强度。得到电阻率与粘度之比和噪声强度。根据速度和磁场的异常尺寸，表明由于洛伦兹力的重新归一化，动能谱比磁能陡，这与正粘度的情况相反。

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