6 papers
Bootstrapping the Four-Point NMHV Stress-Tensor Form Factor
Song He, Jiahao Liu, Qinglin Yang
We bootstrap the four-point next-to-maximally helicity-violating (NMHV) form factor of the chiral stress-tensor supermultiplet in planar maximally supersymmetric Yang-Mills theory…
Notes on Diagrammatic Coaction for Cosmological Wavefunction Coefficients: A Two-Site Prelude
Yuhan Fu, Jiahao Liu
We study the coaction of cosmological wavefunction coefficients of conformally coupled scalars in FRW background of a two-site example, which turns out to have an elegant diagramma…
Heptagon Symbols at Five Loops and All-Loop Sequences
Song He, Xuhang Jiang, Xiang Li +1
We revisit the symbol bootstrap program for the seven-particle MHV and NMHV amplitudes in planar super-Yang-Mills (SYM) based on the alphabet associated with the $E…
Notes on conformal integrals: Coulomb branch amplitudes, magic identities and bootstrap
Song He, Xuhang Jiang, Jiahao Liu +1
We study multi-loop conformal integrals for four-point correlators of planar super-Yang-Mills theory, and in particular those contributing to Coulomb branch amplitudes…
Symbol letters of Feynman integrals from Gram determinants
Xuhang Jiang, Jiahao Liu, Xiaofeng Xu +1
Symbol letters are crucial for analytically calculating Feynman integrals in terms of iterated integrals. We present a novel method to construct the symbol letters for a given inte…
Landau-based Schubert analysis
Song He, Xuhang Jiang, Jiahao Liu +1
We revisit the conjectural method called Schubert analysis for generating the alphabet of symbol letters for Feynman integrals, which was based on geometries of intersecting lines…