标题： 静止系瞬时形式和开放Nambu弦的Dirac可观测量 显示英文标题

标题： The Rest-Frame Instant Form and Dirac Observables for the Open Nambu String

摘要： 正能部分的开放Nambu弦的静止系瞬时形式被发展出来。 该弦被描述为一个解耦的非局部规范非协变的Newton-Wigner质心，加上一个在Wigner三维空间中生活的Wigner协变相对变量的规范基。 质心携带了一个依赖于弦的不变质量和静止自旋的Poincare'代数表示，这些是相对变量的函数。 利用Frenet-Serret几何方法构建了一个规范不变的Dirac可观测量的规范基。 对规范量子化做出了一些评论。 显示英文摘要

摘要： The rest-frame instant form of the positive-energy part of the open Nambu string is developed. The string is described as a decoupled non-local canonical non-covariant Newton-Wigner center of mass plus a canonical basis of Wigner-covariant relative variables living in the Wigner 3-spaces. The center of mass carries a realization of the Poincare' algebra depending upon the invariant mass and the rest-spin of the string, functions of the relative variables. A canonical basis of gauge invariant Dirac observables is built with Frenet-Serret geometrical methods. Some comments on canonical quantization are made.