2001/10/02 by Thomas DeGrand
Physics and Astronomy · #hep-lat
published as Nucl.Phys.Proc.Suppl. 106 (2002) 566-568 · Lattice2001(confinement)
arxiv created 2001/10/02 · arxiv updated 2009/11/30
A chiral fermion action allows one to do very clean studies of chiral symmetry breaking in QCD. I will briefly describe how to compute with the overlap action (relatively) cheaply, and then turn to physics: Low modes of the Dirac operator show a ``lumped'' chiral density which peaks at the locations of instantons and anti-instantons. These modes dominate correlation functions at small quark mass in many channels. The picture qualitatively (and in some cases quantitatively) resembles an instanton liquid model.