Algebraic relations between harmonic sums and associated quantities. (English) Zbl 1097.11063
Summary: We derive the algebraic relations of alternating and non-alternating finite harmonic sums up to the sums of depth 6. All relations for the sums up to weight 6 are given in explicit form. These relations depend on the structure of the index sets of the harmonic sums only, but not on their value. They are therefore valid for all other mathematical objects which obey the same multiplication relation or can be obtained as a special case thereof, such as the harmonic polylogarithms. We verify that the number of independent elements for a given index set can be determined by counting the Lyndon words which are associated to this set. The algebraic relations between the finite harmonic sums can be used to reduce the high complexity of the expressions for the Mellin moments of the Wilson coefficients and splitting functions significantly for massless field theories such as QED and QCD up to three-loop and higher orders in the coupling constant and are also of importance for processes depending on more scales. The ratio of the number of independent sums thus obtained to the number of all sums for a given index set is found to be \(\leq1/d\) with \(d\) the depth of the sum independently of the weight. The corresponding counting relations are given in analytic form for all classes of harmonic sums to arbitrary depth and are tabulated up to depth \(d=10\).
MSC:
| 11Z05 | Miscellaneous applications of number theory |
| 81T15 | Perturbative methods of renormalization applied to problems in quantum field theory |
| 81V05 | Strong interaction, including quantum chromodynamics |
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