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arXiv 1303.1111hep-th
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共形块的径向坐标

Radial Coordinates for Conformal Blocks

Matthijs Hogervorst, Slava Rychkov

摘要:

我们发展了CFT_d中的共形块理论,将其表示为具有Gegenbauer多项式系数的幂级数。当在径向量子化中分析共形块时,这样的级数有明确的物理意义:单个项描述给定自旋的后代的贡献。这些系列的收敛性可以通过径向量化原点的明智选择来优化。我们认为,最好的选择是插入运营商对称。我们详细分析了由此产生的“rho系列”,并表明它比常用的变量z收敛得更快。我们讨论如何这些共形块表示可以用于共形引导。特别是,我们用它们来推导分析一些自举边界,其存在以前发现的数值。

英文摘要:

We develop the theory of conformal blocks in CFT_d expressing them as power series with Gegenbauer polynomial coefficients. Such series have a clear physical meaning when the conformal block is analyzed in radial quantization: individual terms describe contributions of descendants of a given spin. Convergence of these series can be optimized by a judicious choice of the radial quantization origin. We argue that the best choice is to insert the operators symmetrically. We analyze in detail the resulting "rho-series" and show that it converges much more rapidly than for the commonly used variable z. We discuss how these conformal block representations can be used in the conformal bootstrap. In particular, we use them to derive analytically some bootstrap bounds whose existence was previously found numerically.

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