论文标题
来自CFT病房的软光子定理在AD/CFT的平坦限制中识别
Soft photon theorems from CFT Ward identites in the flat limit of AdS/CFT
论文作者
论文摘要
可以从某些CFT相关器的大广告 - 拉迪乌斯极限获得平面中的S-矩阵元素。我们提出了一种构造CFT操作员的方法，该操作员在平坦的空间中创建传入和传出的散射状态。这是通过采用批量操作员重建技术的统一限制来完成的。使用此方法，我们获得了用于传入和传出U（1）量规场的明确表达式。 Weinberg软光子定理然后从保守的CFT电流的病房识别遵循。在四个散装尺寸中，可以使用标准和替代边界条件对AD上的量规场进行量化。更改量化方案对应于散装中SL（2，Z）电磁双重性的S-变化。这使我们能够从CFT物理学中得出平坦空间中的电和磁性软光子定理。
S-matrix elements in flat space can be obtained from a large AdS-radius limit of certain CFT correlators. We present a method for constructing CFT operators which create incoming and outgoing scattering states in flat space. This is done by taking the flat limit of bulk operator reconstruction techniques. Using this method, we obtain explicit expressions for incoming and outgoing U(1) gauge fields. Weinberg soft photon theorems then follow from Ward identites of conserved CFT currents. In four bulk dimensions, gauge fields on AdS can be quantized with standard and alternative boundary conditions. Changing the quantization scheme corresponds to the S-transformation of SL(2,Z) electric-magnetic duality in the bulk. This allows us to derive both, the electric and magnetic soft photon theorems in flat space from CFT physics.
