Shift operators from the simplex representation in momentum-space CFT

Caloro, Francesca; McFadden, Paul

Abstract

We derive parametric integral representations for the general n-point function of scalar operators in momentum-space conformal field theory. Recently, this was shown to be expressible as a generalised Feynman integral with the topology of an (n − 1)-simplex, featuring an arbitrary function of momentum-space cross ratios. Here, we show all graph polynomials for this integral can be expressed in terms of the first and second minors of the Laplacian matrix for the simplex. Computing the effective resistance between nodes of the corresponding electrical network, an inverse parametrisation is found in terms of the determinant and first minors of the Cayley-Menger matrix. These parametrisations reveal new families of weight-shifting operators, expressible as determinants, that connect n-point functions in spacetime dimensions differing by two. Moreover, the action of all previously known weight-shifting operators preserving the spacetime dimension is manifest. Finally, the new parametric representations enable the validity of the conformal Ward identities to be established directly, without recourse to recursion in the number of points.

Citation

Caloro, F., & McFadden, P. (2023). Shift operators from the simplex representation in momentum-space CFT. Journal of High Energy Physics, Article 106. https://doi.org/10.1007/JHEP03%282023%29106

• Journal Article Type: Article
• Acceptance Date: Feb 28, 2023
• Online Publication Date: Mar 15, 2023
• Publication Date: 2023
• Deposit Date: Feb 28, 2025
• Journal: JHEP
• Print ISSN: 1126-6708
• Electronic ISSN: 1029-8479
• Publisher: Scuola Internazionale Superiore di Studi Avanzati (SISSA)
• Peer Reviewed: Peer Reviewed
• Article Number: 106
• DOI: https://doi.org/10.1007/JHEP03%282023%29106
• Public URL: https://durham-repository.worktribe.com/output/2981176
• Additional Information: Available open access via DOI