Stochastic Estimations of Fermion Matrix Determinants with Unbiased Subtractions
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Abstract
The Padé-Z2 stochastic estimator is used to calculate the fermion matrix determinants and the determinant ratios with an unbiased variational scheme. The results on an 83 x 12 lattice with Wilson action show that the determinant ratio with a relatively small number of Z2 noises (e.g., 400) can be estimated by using the unbiased subtractions. -