HYBRID MONTE-CARLO WITHOUT PSEUDOFERMIONS

We introduce a dynamical fermion algorithm which is based on the hybri d Monte Carlo (HMC) algorithm, but without pseudofermions. The molecul ar dynamics steps in HMC are retained except the derivatives with resp ect to the gauge fields are calculated with the Zz noise. The determin ant ratios are estimated with the Pade-Z(2) method. Finally, we use th e Kennedy-Kuti linear accept/reject test for the Monte Carlo step whic h is shown to respect detailed balance. We comment on the comparison o f this algorithm with the pseudofermion algorithm.