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arXiv 0801.1561hep-th
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作为共形场论的具有RR通量的平面波背景超弦

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

Yoichi Kazama, Naoto Yokoi

摘要:

本文研究了平面波背景下的IIB型超弦,并将其表述为算子形式的精确共形场论。在与RR通量一致的背景下,超弦的一个特征,如AdS 5xS 5及其平面波极限,是世界面上左移和右移的自由度是内在耦合的。在平面波的情况下,它表现在一个众所周知的事实,即格林-施瓦兹公式的理论减少到自由质量玻色子和费米子在光锥规范。这就提出了一个明显的问题,即这个特征如何与弦论的基本共形对称性相协调。通过采用半光锥共形规范,我们将表明,尽管存在这样的非线性左右耦合,人们可以构造两个独立的集合的量子Virasoro运营商的领域服从自由场对易关系。此外,我们证明了BRST上同调分析再现了光锥规范中获得的物理谱。

英文摘要:

We study the type IIB superstring in the plane-wave background with Ramond-Ramond flux and formulate it as an exact conformal field theory in operator formalism. One of the characteristic features of the superstring in a consistent background with RR flux, such as the AdS5xS5 and its plane-wave limit, is that the left- and the right-moving degrees of freedom on the worldsheet are inherently coupled. In the plane-wave case, it is manifested in the well-known fact that the Green-Schwarz formulation of the theory reduces to that of free massive bosons and fermions in the light-cone gauge. This raises the obvious question as to how this feature is reconciled with the underlying conformal symmetry of the string theory. By adopting the semi-light-cone conformal gauge, we will show that, despite the existence of such non-linear left-right couplings, one can construct two independent sets of quantum Virasoro operators in terms of fields obeying the free-field commutation relations. Furthermore, we demonstrate that the BRST cohomology analysis reproduces the physical spectrum obtained in the light-cone gauge.

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