2 papers
hep-th2019
Hypergeometric Series Representations of Feynman Integrals by GKZ Hypergeometric Systems
René Pascal Klausen
We show that almost all Feynman integrals as well as their coefficients in a Laurent series in dimensional regularization can be written in terms of Horn hypergeometric functions.…
hep-th2018
The number of master integrals as Euler characteristic
Thomas Bitoun, Christian Bogner, René Pascal Klausen +1
We give a brief introduction to a parametric approach for the derivation of shift relations between Feynman integrals and a result on the number of master integrals. The shift rela…