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arXiv 1504.04854hep-phastro-ph.COastro-ph.HEhep-th
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手征相对论流体的磁流体动力学

Magnetohydrodynamics of Chiral Relativistic Fluids

Alexey Boyarsky, Jurg Frohlich, Oleg Ruchayskiy

摘要:

我们研究了带电相对论费米子等离子体在非常高的温度$T\gg m$,其中$m$是费米子质量,耦合到电磁场的动力学。特别是,我们得到这样的等离子体的演化的磁流体动力学描述。我们表明,相比传统的MHD的非相对论粒子的等离子体,流体动力学描述的相对论等离子体涉及新的自由度所描述的伪标量场起源于一个本地的不对称性的密度的左手和右手费米子。这个场可以解释为有效的轴子场。考虑到手征异常,我们提出的动力学方程的演变,以及其他领域出现在MHD描述的等离子体。由于它与螺旋磁场的非线性耦合,轴子场对磁化等离子体的动力学有显著的影响,并能产生一种新型的逆级联。

英文摘要:

We study the dynamics of a plasma of charged relativistic fermions at very high temperature $T\gg m$, where $m$ is the fermion mass, coupled to the electromagnetic field. In particular, we derive a magneto-hydrodynamical description of the evolution of such a plasma. We show that, as compared to conventional MHD for a plasma of non-relativistic particles, the hydrodynamical description of the relativistic plasma involves new degrees of freedom described by a pseudo-scalar field originating in a local asymmetry in the densities of left-handed and right-handed fermions. This field can be interpreted as an effective axion field. Taking into account the chiral anomaly we present dynamical equations for the evolution of this field, as well as of other fields appearing in the MHD description of the plasma. Due to its non-linear coupling to helical magnetic fields, the axion field significantly affects the dynamics of a magnetized plasma and can give rise to a novel type of inverse cascade.

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