Symmetry, Integrability and Geometry: Methods and Applications (SIGMA)

SIGMA 17 (2021), 101, 23 pages           https://doi.org/10.3842/SIGMA.2021.101
Contribution to the Special Issue on Algebraic Structures in Perturbative Quantum Field Theory in honor of Dirk Kreimer for his 60th birthday

The Algebraic Structure of the KLT Relations for Gauge and Gravity Tree Amplitudes

Hadleigh Frost
Mathematical Institute, University of Oxford, Oxford, UK

Received March 01, 2021, in final form November 01, 2021; Published online November 14, 2021

Abstract
We study the Kawai-Lewellen-Tye (KLT) relations for quantum field theory by reformulating it as an isomorphism between two Lie algebras. We also show how explicit formulas for KLT relations arise when studying rational functions on ${\mathcal M}_{0,n}$, and prove identities that allow for arbitrary rational functions to be expanded in any given basis. Via the Cachazo-He-Yuan formulas for, these identities also lead to new formulas for gauge and gravity tree amplitudes, including formulas for so-called Bern-Carrasco-Johansson numerators, in the case of non-linear sigma model and maximal-helicity-violating Yang-Mills amplitudes.

Key words: perturbative gauge theory; double copy; binary trees; Lie coalgebras; Lie polynomials.

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