标题： 宇宙弦周围在德西特时空中的真空极化 显示英文标题

标题： Vacuum polarization around cosmic strings in de Sitter spacetime

摘要： 宇宙弦是由早期宇宙中基本对称性的自发破缺产生的最流行的拓扑缺陷。 它们是宇宙学和天体物理学中许多有趣效应的来源。 一个有趣的现象是，由于宇宙弦周围时空的非平凡拓扑性，导致量子场的真空态极化。 在本文中，我们描述了直宇宙弦和引力场对标量、旋量和电磁真空局部性质的综合影响。 局部德西特时空被考虑为背景几何结构。 结果显示，在距离弦的尺度约为或大于曲率半径时，时空曲率的影响是重要的。 一个定性上的新特性是，相对于宇宙弦的径向方向上出现了真空能量通量。 显示英文摘要

摘要： Cosmic strings are the most popular topological defects arising from the spontaneous breaking of fundamental symmetries in the early Universe. They are the source of a number of interesting effects in cosmology and astrophysics. An interesting effect is the polarization of the vacuum state for quantum fields induced by the non-trivial topology of the spacetime around cosmic strings. In the present paper we describe the combined effects of the straight cosmic string and the gravitational field on the local properties of scalar, spinor and electromagnetic vacua. The local de Sitter spacetime is considered as the background geometry. It is shown that the influence of the spacetime curvature is essential at distances from the string of the order of or larger than the curvature radius. A qualitatively new feature is the appearance of the vacuum energy flux in the radial direction with respect to the cosmic string.