论文标题
在存在随机磁场的情况下，宇宙中的宇宙射线传播
Cosmic ray propagation in the Universe in presence of a random magnetic field
论文作者
论文摘要
超高能量宇宙射线的起源仍然是一个谜。但是，由于当前的宇宙射线观测器记录了良好的质量数据，在过去几年中取得了很大的进步。最近的成就之一是获得了皮埃尔·埃格尔天文台（Pierre Auger Observatory）最有能力的宇宙射线外的稳固的观察证据。另一方面，据信有一个填充银河系间介质的非湍流磁场。因此，白术磁场的存在可以在超高能量宇宙射线通过宇宙的传播中起重要作用，从原则上讲，这与解释实验数据可能相关。在这项工作中，我们提出了一个偏微分方程的系统，该系统描述了在存在湍流的层间磁场的情况下，超高能量宇宙射线在宇宙中传播，其中包括传播的扩散和弹道态，以及它们之间的过渡。同样，作为应用程序的一个示例，方程系统在简化的物理情况下进行数值求解。
The origin of the ultrahigh energy cosmic ray remains being a mystery. However, a considerable progress has been made in the past few years due to the good quality data recorded by current cosmic ray observatories. One of the recent achievements is obtaining firm observational evidence about the extragalactic origin of the most energetic cosmic rays by the Pierre Auger observatory. On the other hand, it is believed that there is a non-null turbulent magnetic field that fills the intergalactic medium. Therefore, the presence of the intergalactic magnetic field can play an important role on the propagation of the ultrahigh energy cosmic rays through the Universe, which in principle can be relevant to interpret the experimental data. In this work we present a system of partial differential equations that describes the propagation of the ultrahigh energy cosmic rays through the Universe, in the presence of a turbulent intergalactic magnetic field, that includes the diffusive and the ballistic regime of propagation and also the transition between them. Also, as an example of application, the system of equations is solved numerically in a simplified physical situation.
