Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2003-03-12
Physics
High Energy Physics
High Energy Physics - Lattice
32 pages, v3:some clarifications, and the discrete symmetries of quark observables are discussed
Scientific paper
I introduce two new boundary layers to the optimal domain-wall fermion action, and formulate vector gauge theories (e.g., QCD) with the new action. The generating functional for n-point Green's function of quark fields is derived. The bilinear and higher-order quark observables are shown to be a_5-invariant, to possess optimal chiral symmetry for any finite N_s, as well as to preserve continuum discrete symmetries at finite lattice spacing. With 2D abelian background gauge fields, I compute the index, the axial anomaly, and the fermion determinant (ratio) of the effective lattice Dirac operator, for the optimal DWF and the conventional DWF respectively. All quantities of the optimal DWF are in good agreement with the exact solution, but the fermion determinant (ratio) of the conventional DWF disagrees with the exact solution, for topologically nontrivial sectors.
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