标题： 宇宙弦碰撞在宇宙背景中的研究 显示英文标题

标题： Cosmic Strings Collision in Cosmological Backgrounds

摘要： 研究了宇宙弦环的碰撞以及膨胀背景下结点形成的动力学。 控制结点形成动力学、宇宙弦拉链式闭合并解开的关键参数是环相对于碰撞时哈勃膨胀率的大小。 我们针对大超视界尺寸的环、小亚视界尺寸的环以及半径与碰撞时哈勃膨胀率相当的环，分别进行了解析和数值研究。 显示英文摘要

摘要： The collisions of cosmic strings loops and the dynamics of junctions formations in expanding backgrounds are studied. The key parameter controlling the dynamics of junctions formation, the cosmic strings zipping and unzipping is the relative size of the loops compared to the Hubble expansion rate at the time of collision. We study analytically and numerically these processes for large super-horizon size loops, for small sub-horizon size loops as well as for loops with the radii comparable to the Hubble expansion rate at the time of collision.