S E Derkachov et al 1990 J. Phys. A: Math. Gen. 23 5563 doi:10.1088/0305-4470/23/23/028
S E Derkachov, J Honkonen and Y M Pis'mak
Show affiliationsThe method and details of the calculation of the three-loop contribution to the anomalous dimension of the diffusion coefficient of the model of a random walk in a potential random field with long-range correlations are presented. Contrary to earlier conjectures, this contribution does not vanish identically. A new method of calculation of multi-loop Feynman graphs with complicated numerator structure is suggested. It leads to simpler integrals in a space of higher dimensionality, which are computed using the recursion relations of the uniqueness method.
82B20 Lattice systems (Ising, dimer, Potts, etc.) and systems on graphs
82B28 Renormalization group methods (See also 81T17)
82B41 Random walks, random surfaces, lattice animals, etc. (See also 60G50, 82C41)
Issue 23 (7 December 1990)
S E Derkachov et al 1990 J. Phys. A: Math. Gen. 23 5563
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