Dirac operator normality and chiral properties on the lattice

Details Dirac operator normality and chiral properties on the lattice Dirac operator normality and chiral properties on the lattice

1999-05-07

arxiv.org/abs/hep-lat/9905010v1

Physics

High Energy Physics

High Energy Physics - Lattice

16 pages, LaTeX

Scientific paper

Normality in connection with $\gamma_5$-hermiticity determines the basic chiral properties and rules. The Ginsparg-Wilson (GW) relation is one of the allowed constraints on the spectrum. Interrelations between features of the spectrum, the sum rule for chiral differences of real modes and contributions to the Ward identity are pointed out. The alternative chiral transformation of L\"uscher gives the same Ward identity as the usual one, in the global and in the local case. Imposing normality on a general function of the hermitean Wilson-Dirac (HWD) operator, inevitably leads at the same time to the Neuberger operator and to the GW relation. In this context also the case with zero eigenvalues of the HWD operator is handled. The eigenvalue flows of the HWD operator obey a differential equation the characteristic features of the solutions of which are discussed.

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