Direct Proof of Reflection Positivity of Free Overlap Dirac Fermion

Abstract

It is shown that free lattice Dirac fermions defined by overlap Dirac operator fulfill the Osterwalder-Schrader reflection positivity condition with respect to the link-reflection.

Comments: 7 pages, presented at the XXVIII International Symposium on Lattice Field Theory, Lattice 2010, title slightly modified. v2 minor corrections