Multiple zeta functions and double wrapping in planar N=4 SYM
Sébastien Leurent, Dmytro Volin
备注：
49 pages. Available online Mathematica packages contain routines for working with multiple Hurwitz zeta functions and weak coupling expansion of the FiNLIE, they are an important part of the article. The article has interactive symbols "#" (they work in pdf-viewers that support JavaScript); v2: terminology is made more precise, references added; v3: published version
发表信息：
Nuclear Physics B (2013), Volume 875, Isuue 3, Pages 757-789
Using the FiNLIE solution of the AdS/CFT Y-system, we compute the anomalous dimension of the Konishi operator in planar N=4 SYM up to eight loops, i.e. up to the leading double wrapping order. At this order a non reducible Euler-Zagier sum, zeta(1,2,8), appears for the first time. We find that at all orders in perturbation, every spectral-dependent quantity of the Y-system is expressed through multiple Hurwitz zeta functions, hence we provide a Mathematica package to manipulate these functions, including the particular case of Euler-Zagier sums. Furthermore, we conjecture that only Euler-Zagier sums can appear in the answer for the anomalous dimension at any order in perturbation theory.
We also resum the leading transcendentality terms of the anomalous dimension at all orders, obtaining a simple result in terms of Bessel functions. Finally, we demonstrate that exact Bethe equations should be related to an absence of poles condition that becomes especially nontrivial at double wrapping.
