Abstract
Two degenerate flavors of quarks are simulated with small masses down to about one fifth of the strange quark mass by using the two-step multi-boson (TSMB) algorithm. The lattice size is $8^3 \times 16$ with lattice spacing about $a \simeq 0.27 {\mathrm {fm}}$ which is not far from the N t =4 thermodynamical cross-over line. Autocorrelations of different physical quantities are estimated as a function of the quark mass. The eigenvalue spectra of the Wilson-Dirac operator are investigated.
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