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arXiv 2202.08288hep-th
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天体共形场论基础

Elements of Celestial Conformal Field Theory

Wei Fan, Angelos Fotopoulos, Stephan Stieberger, Tomasz R. Taylor, Bin Zhu

摘要:

在天体全息中,四维散射振幅被认为是假定的二维天体共形场论(CCFT)的二维共形子。将动量空间振幅转换为CCFT变换子的最简单方法是将它们与光锥能量进行梅林变换。然而,对于无质量的粒子,比如胶子,这样的构造导致了三点和四点的量子化,除了天球坐标的零测度超曲面之外,它们在任何地方都消失了。这是由于四维动量守恒定律限制了与无质量粒子相关的算子的插入点。这些散射子让人想起库仑气体散射子,在没有背景电荷的情况下,由于电荷守恒而消失。我们通过将杨-米尔斯理论耦合到背景介子场来提供背景动量,(复杂的)介子源定域在天球上。这幅图来自于对班纳吉和高希发现的微分方程组解的物理解释。我们表明,解决方案可以写为梅林变换的幅度评估在这样一个背景下的电子。由此产生的三胶子和四胶子振幅是天体坐标的单值函数,具有交叉对称性和标准CFT量子化器所期望的所有其他性质。我们使用它们来提取OPEs,并将它们与从没有胶子背景的多胶子天体振幅中提取的OPEs进行比较。我们进行共形块分解的四胶子单值相关,并确定的尺寸,自旋和群表示的整个初级场谱的杨米尔斯部门的CCFT。

英文摘要:

In celestial holography, four-dimensional scattering amplitudes are considered as two-dimensional conformal correlators of a putative two-dimensional celestial conformal field theory (CCFT). The simplest way of converting momentum space amplitudes into CCFT correlators is by taking their Mellin transforms with respect to light-cone energies. For massless particles, like gluons, however, such a construction leads to three-point and four-point correlators that vanish everywhere except for a measure zero hypersurface of celestial coordinates. This is due to the four-dimensional momentum conservation law that constrains the insertion points of the operators associated with massless particles. These correlators are reminiscent of Coulomb gas correlators that, in the absence of background charges, vanish due to charge conservation. We supply the background momentum by coupling Yang-Mills theory to a background dilaton field, with the (complex) dilaton source localized on the celestial sphere. This picture emerges from the physical interpretation of the solutions of the system of differential equations discovered by Banerjee and Ghosh. We show that the solutions can be written as Mellin transforms of the amplitudes evaluated in such a dilaton background. The resultant three-gluon and four-gluon amplitudes are single-valued functions of celestial coordinates enjoying crossing symmetry and all other properties expected from standard CFT correlators. We use them to extract OPEs and compare them with the OPEs extracted from multi-gluon celestial amplitudes without a dilaton background. We perform the conformal block decomposition of the four-gluon single-valued correlator and determine the dimensions, spin and group representations of the entire primary field spectrum of the Yang-Mills sector of CCFT.

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