Wednesday, November 7, 2012

1211.1214 (Jacob Finkenrath et al.)

Application of Domain Decomposition to the Evaluation of Fermion
Determinant Ratios
   [PDF]

Jacob Finkenrath, Francesco Knechtli, Björn Leder
We analyze the fluctuations in the case of mass reweighting for N_f=2 Wilson fermions. We use a domain decomposition factorization of the fermion determinant. Ratios of determinants are estimated stochastically. We study the stochastic and the ensemble fluctuations as a function of the volume V and the mass shift Delta m. With our result it is possible to estimate the cost and the effectiveness of mass reweighting. In addition we introduce a stochastic estimation for the one flavor case without using the square root.
View original: http://arxiv.org/abs/1211.1214

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