Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2000-12-06
Prog.Theor.Phys. 107 (2002) 163-175
Physics
High Energy Physics
High Energy Physics - Lattice
13 pages, 3 figures, minor modifications including typos, a reference added
Scientific paper
10.1143/PTP.107.163
We investigate the index of the Neuberger's Dirac operator in abelian gauge theories on finite lattices by numerically analyzing the spectrum of the hermitian Wilson-Dirac operator for a continuous family of gauge fields connecting different topological sectors. By clarifying the characteristic structure of the spectrum leading to the index theorem we show that the index coincides to the topological charge for a wide class of gauge field configurations. We also argue that the index can be found exactly for some special but nontrivial configurations in two dimensions by directly analyzing the spectrum.
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