Two-flavor lattice QCD simulation in the epsilon-regime with exact chiral symmetry

We perform lattice simulations of two-flavor QCD using Neuberger's overlap fermion, with which the exact chiral symmetry is realized at finite lattice spacings. The {epsilon} regime is reached by decreasing the light quark mass down to 3 MeV on a 16{sup 3}x32 lattice with a lattice spacing {approx}0.11 fm. We find a good agreement of the low-lying Dirac eigenvalue spectrum with the analytical predictions of the chiral random matrix theory, which reduces to the chiral perturbation theory in the {epsilon} regime. The chiral condensate is extracted as {sigma}{sup MS}(2 GeV)=(251{+-}7{+-}11 MeV){sup 3}, where the errors are statistical and an estimate of the higher order effects in the {epsilon} expansion.