# Applications of dispersive sum rules: $ε$-expansion and holography

### Submission summary

 As Contributors: Joao A. Silva Arxiv Link: https://arxiv.org/abs/2009.13506v2 (pdf) Date submitted: 2021-02-05 13:03 Submitted by: A. Silva, Joao Submitted to: SciPost Physics Academic field: Physics Specialties: High-Energy Physics - Theory Approach: Theoretical

### Abstract

We use Mellin space dispersion relations together with Polyakov conditions to derive a family of sum rules for Conformal Field Theories (CFTs). The defining property of these sum rules is suppression of the contribution of the double twist operators. Firstly, we apply these sum rules to the Wilson-Fisher model in $d=4-\epsilon$ dimensions. We re-derive many of the known results to order $\epsilon^4$ and we make new predictions. No assumption of analyticity down to spin $0$ was made. Secondly, we study holographic CFTs. We use dispersive sum rules to obtain tree-level and one-loop anomalous dimensions. Finally, we briefly discuss the contribution of heavy operators to the sum rules in UV complete holographic theories.

###### Current status:
Editor-in-charge assigned