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arXiv 1703.04589hep-th
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黎曼球面上的时空CFTs

Space-time CFTs from the Riemann sphere

Tim Adamo, Ricardo Monteiro, Miguel F. Paulos

摘要:

我们考虑二维手征,一阶共形场论从黎曼球到闵可夫斯基空间内的投影光锥的映射-自然设置描述共形场论在两个更少的维度。这些理论有一个SL(2)代数的局部玻色子约束,可以补充额外的费米子约束,这取决于理论的物质内容。通过计算与规范固定这些约束相关联的BRST电荷,我们发现对于特定的目标空间维度消失的异常。这些临界尺寸与(双伴随)立方标量理论、规范理论和引力经典共形不变的临界尺寸精确吻合。此外,BRST上同调的每个理论包含顶点运营商的完整的共形多重单场插入在这些时空的CFTs。我们给出了一个处方的三点函数的计算,并比较我们的形式主义与散射方程的方法壳振幅。

英文摘要:

We consider two-dimensional chiral, first-order conformal field theories governing maps from the Riemann sphere to the projective light cone inside Minkowski space -- the natural setting for describing conformal field theories in two fewer dimensions. These theories have a SL(2) algebra of local bosonic constraints which can be supplemented by additional fermionic constraints depending on the matter content of the theory. By computing the BRST charge associated with gauge fixing these constraints, we find anomalies which vanish for specific target space dimensions. These critical dimensions coincide precisely with those for which (biadjoint) cubic scalar theory, gauge theory and gravity are classically conformally invariant. Furthermore, the BRST cohomology of each theory contains vertex operators for the full conformal multiplets of single field insertions in each of these space-time CFTs. We give a prescription for the computation of three-point functions, and compare our formalism with the scattering equations approach to on-shell amplitudes.

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