各向异性磁化宇宙中度规微扰非线性驱动的Alfven模
Alfven modes driven non-linearly by metric perturbations in anisotropic magnetized cosmologies
摘要：
我们考虑充满导电等离子体流体的各向异性磁化宇宙学，并研究平行于环境磁场传播的度量扰动的影响。已知在相对于扰动幅度的一阶（线性）近似中，没有电场和密度扰动出现。然而，当我们考虑度量扰动与其时间导数的非线性耦合时，某些类型的解可以引起在时间上急剧增加的电场扰动。这是验证数值和分析。这些扰动的来源可以是在宇宙演化的早期阶段由宇宙泵场驱动的高频量子真空涨落，或者是天体物理过程，或者是最初各向异性宇宙时空的非线性各向同性过程。
英文摘要：
We consider anisotropic magnetized cosmologies filled with conductive plasma fluid and study the implications of metric perturbations that propagate parallel to the ambient magnetic field. It is known that in the first order (linear) approximation with respect to the amplitude of the perturbations no electric field and density perturbations arise. However, when we consider the non-linear coupling of the metric perturbations with their temporal derivatives, certain classes of solutions can induce steeply increasing in time electric field perturbations. This is verified both numerically and analytically. The source of these perturbations can be either high-frequency quantum vacuum fluctuations, driven by the cosmological pump field, in the early stages of the evolution of the Universe or astrophysical processes or a non-linear isotropization process of an initially anisotropic cosmological spacetime.
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