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arXiv 2104.13432hep-th
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天体CFT中的共形块展开

Conformal Block Expansion in Celestial CFT

Alexander Atanasov, Walker Melton, Ana-Maria Raclariu, Andrew Strominger

摘要:

在共形初级粒子波函数的基础上,给出了无质量标量通过质量交换的四维四点散射振幅。这个天体振幅在酉主级数上的二维共形分波的基础上展开,然后通过轮廓变形重写为二维共形块的和。共形块包括自旋光线状态的中间交换,以及具有正整数共形权重的标量状态。共形块前因子被发现预期是二次的天体OPE系数。

英文摘要:

The 4D 4-point scattering amplitude of massless scalars via a massive exchange is expressed in a basis of conformal primary particle wavefunctions. This celestial amplitude is expanded in a basis of 2D conformal partial waves on the unitary principal series, and then rewritten as a sum over 2D conformal blocks via contour deformation. The conformal blocks include intermediate exchanges of spinning light-ray states, as well as scalar states with positive integer conformal weights. The conformal block prefactors are found as expected to be quadratic in the celestial OPE coefficients.

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