Renormalization group flow and fixed point of the lattice topological charge in the 2-d O(3) sigma-model

Details Renormalization group flow and fixed point of the lattice topological charge in the 2-d O(3) sigma-model Renormalization group flow and fixed point of the lattice topological charge in the 2-d O(3) sigma-model

1995-11-20

arxiv.org/abs/hep-lat/9511021v2

Phys.Rev. D55 (1997) 2274-2282

Physics

High Energy Physics

High Energy Physics - Lattice

29 pages (25 PostScript file text + 4 PostScript figures); revised version with new title, new abstract, added conclusions and

Scientific paper

10.1103/PhysRevD.55.2274

We study the renormalization group evolution up to the fixed point of the lattice topological susceptibility in the 2-d O(3) non-linear sigma-model. We start with a discretization of the continuum topological charge by a local charge density, polynomial in the lattice fields. Among the different choices we propose also a Symanzik--improved lattice topological charge. We check step by step in the renormalization group iteration the progressive dumping of quantum fluctuations, which are responsible for the additive and multiplicative renormalizations of the lattice topological susceptibility with respect to the continuum definition. We find that already after three iterations these renormalizations are negligible and an excellent approximation of the fixed point is achieved. We also check by an explicit calculation that the assumption of slowly varying fields in iterating the renormalization group does not lead to a good approximation of the fixed point charge operator.

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