EXACT SOLUTION OF A BOUNDARY CONFORMAL FIELD-THEORY

被引：173

作者：

CALLAN, CG ^{[1
]}

KLEBANOV, IR ^{[1
]}

LUDWIG, AWW ^{[1
]}

MALDACENA, JM ^{[1
]}

机构：

[1] PRINCETON UNIV,DEPT PHYS,PRINCETON,NJ 08544

来源：

NUCLEAR PHYSICS B | 1994年 / 422卷 / 03期

基金：

美国国家科学基金会;

关键词：

D O I：

10.1016/0550-3213(94)90440-5

中图分类号：

O412 [相对论、场论]; O572.2 [粒子物理学];

学科分类号：

摘要：

We study the conformal field theory of a free massless scalar field living on the half-line with interactions introduced via a periodic potential at the boundary. An SU(2) current algebra underlies this system and the interacting boundary state is given by a global SU(2) rotation of the left-moving fields in the zero-potential (Neumann) boundary state. As the potential strength varies from zero to infinity, the boundary state interpolates between the Neumann and the Dirichlet values. The full S-matrix for scattering from the boundary, with arbitrary particle production, is explicitly computed. To maintain unitarity, it is necessary to attribute a hidden discrete ''soliton'' degree of freedom to the boundary. The same unitarity puzzle occurs in the Kondo problem, and we anticipate a similar solution.

引用

页码：417 / 448

页数：32

共 23 条

[1] OPEN STRINGS IN BACKGROUND GAUGE-FIELDS [J].