Communications in Number Theory and Physics

Volume 12 (2018)

Number 1

Renormalisation group for multiple zeta values

Pages: 75 – 96

DOI: https://dx.doi.org/10.4310/CNTP.2018.v12.n1.a3

Authors

Kurusch Ebrahimi-Fard (Department of Mathematical Sciences, Norwegian University of Science and Technology (NTNU), Trondheim, Norway)

Dominique Manchon (Université Blaise Pascal, C.N.R.S., Aubière, France)

Johannes Singer (Department Mathematik, Friedrich–Alexander–Universität Erlangen–Nürnberg, Erlangen, Germany)

Janqiang Zhao (ICMAT, C/Nicolás Cabrera, Madrid, Spain)

Abstract

Calculating multiple zeta values at arguments of any sign in a way that is compatible with both the quasi-shuffle product as well as meromorphic continuation, is commonly referred to as the renormalisation problem for multiple zeta values. We consider the set of all solutions to this problem and provide a framework for comparing its elements in terms of a free and transitive action of a particular subgroup of the group of characters of the quasi-shuffle Hopf algebra. In particular, this provides a transparent way of relating different solutions at non-positive values, which answers an open question in the recent literature.

Received 8 November 2016

Accepted 20 October 2017

Published 27 April 2018