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arXiv 0807.4001hep-th
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用共形场论研究具有RR通量的pp波背景超弦

Superstring in the pp-wave background with RR flux as a conformal field theory

Yoichi Kazama

摘要:

本文简要介绍了我们最近在半光锥共形规范下利用Green-Schwarz形式对具有Ramond-Ramond(RR)通量的pp波背景下超弦的精确共形场论(CFT)公式所做的工作.由于RR通量的存在,世界表上的左移和右移自由度是内在耦合的,这使得正则分析即使在经典水平上也难以处理。为了克服这个困难,我们开发了一个相空间的制定,它不使用的运动方程,并构建两个独立的Virasoro发电机经典。在量子化时,由于RR通量的存在,维拉索罗代数一般会发展出量子算符反常,只有明智地选择正常的有序描述,它们才能在玻色子和费米子贡献之间消除。有了这样适当定义的量子Virasoro生成元,人们可以构造BRST算子,并证明BRST上同调分析再现了以前在光锥规范中获得的物理谱。

英文摘要:

We provide a concise description of our recent work on the exact conformal field theory (CFT) formulation of the superstring in the pp-wave background with Ramond-Ramond (RR) flux, using the Green-Schwarz formalism in the semi-light-cone conformal gauge. Due to the presence of the RR flux, the left- and the right-moving degrees of freedom on the worldsheet are inherently coupled and this makes the canonical analysis intractable even at the classical level. To overcome this difficulty, we develop a phase-space formulation which does not make use of the equations of motion, and construct two independent sets of Virasoro generators classically. Upon quantization, due to the presence of the RR flux, the Virasoro algebra generically develops quantum operator anomalies and only with a judicious choice of normal ordering rescription they cancel between the bosonic and the fermionic contributions. With such properly defined quantum Virasoro generators, one can construct the BRST operators and demonstrate that the BRST cohomology analysis reproduces the physical spectrum previously obtained in the light-cone gauge.

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