Topological charge on the lattice: a field theoretical view of the geometrical approach

Details Topological charge on the lattice: a field theoretical view of the geometrical approach Topological charge on the lattice: a field theoretical view of the geometrical approach

1996-10-02

arxiv.org/abs/hep-lat/9610004v1

Nucl.Phys. B489 (1997) 453-468

Physics

High Energy Physics

High Energy Physics - Lattice

14 pages, revtex

Scientific paper

10.1016/S0550-3213(97)00044-8

We construct sequences of ``field theoretical'' (analytical) lattice topological charge density operators which formally approach geometrical definitions in 2-d $CP^{N-1}$ models and 4-d $SU(N)$ Yang Mills theories. The analysis of these sequences of operators suggests a new way of looking at the geometrical method, showing that geometrical charges can be interpreted as limits of sequences of field theoretical (analytical) operators. In perturbation theory renormalization effects formally tend to vanish along such sequences. But, since the perturbative expansion is asymptotic, this does not necessarily lead to well behaved geometrical limits. It indeed leaves open the possibility that non-perturbative renormalizations survive.

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