论文标题
宇宙学磁性流动力系统的缩放演变的新描述
New description of the scaling evolution of the cosmological magneto-hydrodynamic system
论文作者
论文摘要
我们提出了原始磁场在非螺旋密度且能量密度大于动能密度的情况下的宇宙学演化的新描述。我们认为，可以根据衰减动力学是线性的，可以通过四个不同的方向描述进化，以及主要的耗散项是剪切粘度还是阻力力。使用此分类和对Hosking积分的保存，我们提出了分析模型，以充分解释具有多种初始条件的场演化的各种数值模拟的结果。已经发现，与传统的智慧相反，由于霍斯金积分的保护，该领域的衰减通常很慢，表现出反向转移。使用此处提出的描述，我们可能会追踪磁场的中间进化历史，并阐明每个处理其演变的过程是否冻结，这对于遵循相对弱磁场的演变至关重要。
We present a new description of cosmological evolution of the primordial magnetic field under the condition that it is non-helical and its energy density is larger than the kinetic energy density. We argue that the evolution can be described by four different regimes, according to whether the decay dynamics is linear or not, and whether the dominant dissipation term is the shear viscosity or the drag force. Using this classification and conservation of the Hosking integral, we present analytic models to adequately interpret the results of various numerical simulations of field evolution with variety of initial conditions. It is found that, contrary to the conventional wisdom, the decay of the field is generally slow, exhibiting the inverse transfer, because of the conservation of the Hosking integral. Using the description proposed here, we may trace the intermediate evolution history of the magnetic field and clarify whether each process governing its evolution is frozen or not, which is essential to follow the evolution of relatively weak magnetic fields.
