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The Index Theorem and Random Matrix Theory for Improved Staggered Quarks

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arxiv hep-lat/0509177 v1 pith:YN5CMDYR submitted 2005-09-29 hep-lat

The Index Theorem and Random Matrix Theory for Improved Staggered Quarks

classification hep-lat
keywords improvedstaggeredcontinuumfindindexlimitmatrixmodes
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study various improved staggered quark Dirac operators on quenched gluon backgrounds in lattice QCD. We find a clear separation of the spectrum of eigenvalues into high chirality, would-be zero modes and others, in accordance with the Index Theorem. We find the expected clustering of the non-zero modes into quartets as we approach the continuum limit. The predictions of random matrix theory for the epsilon regime are well reproduced. We conclude that improved staggered quarks near the continuum limit respond correctly to QCD topology.

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