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arXiv 2005.03667hep-thgr-qc
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AdS/CFT平坦极限下CFT Ward恒等式的软光子定理

Soft photon theorems from CFT Ward identites in the flat limit of AdS/CFT

Eliot Hijano, Dominik Neuenfeld

摘要:

平坦空间中的S-矩阵元可以由某些CFT算子的AdS-半径极限得到。我们提出了一种方法来构建CFT运营商创建传入和传出的散射态在平坦的空间。这是通过采用批量算子重建技术的平坦极限来完成的。利用这种方法,我们得到了输入和输出U(1)规范场的显式表达式。温伯格软光子定理,然后遵循沃德恒等式的保守CFT电流。在4个体维中,AdS上的规范场可以用标准和替代边界条件量子化。改变量子化方案对应于SL(2,Z)电磁对偶性的S变换。这使我们能够从CFT物理学中推导出平坦空间中的电磁软光子定理。

英文摘要:

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.

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