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arXiv 0908.3460hep-th
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AdS3-WZNW模型中的库仑积分和共形块

Coulomb integrals and conformal blocks in the AdS3-WZNW model

Sergio M. Iguri, Carmen A. Núñez

摘要:

利用球上的库仑气体方法研究了AdS 3-WZNW模型中的谱流保持四点关联函数。我们提出了共形块的多重积分实现,并显式计算涉及算子的振幅,其自旋之和的量化值,即,需要整数个第一种屏蔽装料。结果给出了作为一个总和的独立配置的筛选轮廓产生一个单值不变的扩大的权力的世界表模量。然后,我们研究的因式分解的限制,并表明,领导项的总和可以确定,在半经典的限制,与产品的谱流保存三点功能。这些项可以重写为J. Teschner从H3+-WZNW模型中可归一化态的算子乘积展开的假设得到的积分表达式的m基版本。最后,我们确定一组特定的四点函数的因式分解成两个三点函数的产品之间的等价性,无论是保持或违反谱流数守恒。基于此分析,我们认为,振幅的表达式作为一个整体的自旋的中间运营商持有超出半经典制度,从而证实,频谱流守恒的AdS 3-WZNW模型中的相关因子的解析延拓的关联函数的H3+-WZNW模型。

英文摘要:

We study spectral flow preserving four-point correlation functions in the AdS3-WZNW model using the Coulomb gas method on the sphere. We present a multiple integral realization of the conformal blocks and explicitly compute amplitudes involving operators with quantized values of the sum of their spins, i.e., requiring an integer number of screening charges of the first kind. The result is given as a sum over the independent configurations of screening contours yielding a monodromy invariant expansion in powers of the worldsheet moduli. We then examine the factorization limit and show that the leading terms in the sum can be identified, in the semiclassical limit, with products of spectral flow conserving three-point functions. These terms can be rewritten as the m-basis version of the integral expression obtained by J. Teschner from a postulate for the operator product expansion of normalizable states in the H3+-WZNW model. Finally, we determine the equivalence between the factorizations of a particular set of four-point functions into products of two three-point functions either preserving or violating spectral flow number conservation. Based on this analysis we argue that the expression for the amplitude as an integral over the spin of the intermediate operators holds beyond the semiclassical regime, thus corroborating that spectral flow conserving correlators in the AdS3-WZNW model are related by analytic continuation to correlation functions in the H3+-WZNW model.

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