44 citations · 152 across the 12 of their papers we have counts for
5 papers · 1 filter
QPACE -- a QCD parallel computer based on Cell processors
H. Baier, H. Boettiger, M. Drochner +32
QPACE is a novel parallel computer which has been developed to be primarily used for lattice QCD simulations. The compute power is provided by the IBM PowerXCell 8i processor, an e…
A nested Krylov subspace method to compute the sign function of large complex matrices
Jacques C. R. Bloch, Simon Heybrock
We present an acceleration of the well-established Krylov-Ritz methods to compute the sign function of large complex matrices, as needed in lattice QCD simulations involving the ov…
Krylov subspace methods and the sign function: multishifts and deflation in the non-Hermitian case
Jacques C. R. Bloch, Tobias Breu, Andreas Frommer +3
Rational approximations of the matrix sign function lead to multishift methods. For non-Hermitian matrices long recurrences can cause storage problems, which can be circumvented wi…
A nested Krylov subspace method for the overlap operator
Jacques C. R. Bloch, Simon Heybrock
We present a novel method to compute the overlap Dirac operator at zero and nonzero quark chemical potential. To approximate the sign function of large, sparse matrices, standard m…
Short-recurrence Krylov subspace methods for the overlap Dirac operator at nonzero chemical potential
Jacques C. R. Bloch, Tobias Breu, Andreas Frommer +3
The overlap operator in lattice QCD requires the computation of the sign function of a matrix, which is non-Hermitian in the presence of a quark chemical potential. In previous wor…