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arXiv 2101.09017hep-th
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Mellin放大器的交叉对称色散关系

Crossing Symmetric Dispersion Relations for Mellin Amplitudes

Rajesh Gopakumar, Aninda Sinha, Ahmadullah Zahed

摘要:

考虑共形场论中标量四点算符Mellin振幅的显交叉对称色散关系。这使我们能够建立一个坚实的基础上梅林空间的CFTs的非微扰Polyakov自助,从而固定交叉对称块中的接触项模糊性。我们的新方法采用一定的"局部性"的限制,取代了通常的固定-$t$色散关系的交叉对称性的要求。利用这些约束,我们表明,基于两个通道的色散关系和本色散关系的总和规则是相同的。我们的框架使我们能够连接的概念丰富的图片的Polyakov块Witten图在反德西特(AdS)空间。我们还给出了AdS空间中有效场论Wilson系数的双侧界。

英文摘要:

We consider manifestly crossing symmetric dispersion relations for Mellin amplitudes of scalar four point correlators in conformal field theories (CFTs). This allows us to set up the non-perturbative Polyakov bootstrap for CFTs in Mellin space on a firm foundation, thereby fixing the contact term ambiguities in the crossing symmetric blocks. Our new approach employs certain "locality" constraints replacing the requirement of crossing symmetry in the usual fixed-$t$ dispersion relation. Using these constraints we show that the sum rules based on the two channel dispersion relations and the present dispersion relations are identical. Our framework allows us to connect with the conceptually rich picture of the Polyakov blocks being Witten diagrams in anti-de Sitter (AdS) space. We also give two sided bounds for Wilson coefficients for effective field theories in AdS space.

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