Towards the topological susceptibility with overlap fermions

Details Towards the topological susceptibility with overlap fermions Towards the topological susceptibility with overlap fermions

2001-11-13

arxiv.org/abs/hep-lat/0111021v2

Physics

High Energy Physics

High Energy Physics - Lattice

8 pages, substantially revised and updated version, talk presented at NATO Advanced Research Workshop "Confinement, Topology,

Scientific paper

Using a reweighting technique combined with a low-mode truncation of the fermionic determinant, we estimate the quark-mass dependence of the QCD topological susceptibility with overlap fermions. In contrast to previous lattice simulations which all used non-chiral fermions, our results appear to be consistent with the simple continuum model of D\"urr. This indicates that at current lattice spacings the use of the index theorem might not be justified and the fermionic definition of the charge might be needed.

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