标题： 协变闭弦相干态 显示英文标题

标题： Covariant Closed String Coherent States

摘要： 我们给出了协变相干闭弦态的第一个构造，这些态可以被识别为基本宇宙弦。 我们概述了描述宇宙弦的弦态的要求，并使用DDF算符提供了一个明确且简单的映射，将三种不同的描述联系起来：经典弦、光锥规范量子态和协变顶点算符。 朴素的构造导致协变顶点算符的存在需要时空的光锥紧致化。当投影掉基础希尔伯特空间中的光锥紧致态后，所得到的相干态具有经典的解释，并且与任意经典闭弦环存在一一对应关系。 显示英文摘要

摘要： We give the first construction of covariant coherent closed string states, which may be identified with fundamental cosmic strings. We outline the requirements for a string state to describe a cosmic string, and using DDF operators provide an explicit and simple map that relates three different descriptions: classical strings, lightcone gauge quantum states and covariant vertex operators. The naive construction leads to covariant vertex operators whose existence requires a lightlike compactification of spacetime. When the lightlike compactified states in the underlying Hilbert space are projected out the resulting coherent states have a classical interpretation and are in one-to-one correspondence with arbitrary classical closed string loops.