Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-11-10
PoS(Lattice 2011)258
Physics
High Energy Physics
High Energy Physics - Lattice
7 pages, talk presented at The XXIX International Symposium on Lattice Field Theory - Lattice 2011, July 10-16, 2011, Squaw Va
Scientific paper
We investigate how the topological charge density in lattice QCD simulations is affected by violations of chiral symmetry in different fermion actions. To this end we compare lattice configurations generated with a number of different actions including first configurations generated with exact overlap quarks. We visualize the topological profiles after mild smearing. In the topological charge correlator we measure the size of the positive core, which is known to vanish in the continuum limit. To leading order we find the core size to scale linearly with the lattice spacing with the same coefficient for all actions, even including quenched simulations. In the subleading term the different actions vary over a range of about 10 %. Our findings suggest that non-chiral lattice actions at current lattice spacings do not differ much for this specific observable related to topology, both among themselves and compared to overlap fermions.
Bruckmann Falk
Cundy Nigel
Gruber Florian
Lippert Thomas
Sch{ä}fer Andreas
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