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pro vyhledávání: '"Bloch, Jacques C. R."'
Autor:
Bloch, Jacques C. R.
Publikováno v:
PoS(Lattice 2011)184
In this talk we show how the sign problem, occurring in dynamical simulations of random matrices at nonzero chemical potential, can be avoided by judiciously combining matrices into subsets. One can prove that these subsets have real and positive wei
Externí odkaz:
http://arxiv.org/abs/1111.4876
Autor:
Bloch, Jacques C. R., Heybrock, Simon
Publikováno v:
Comput.Phys.Commun.182:878-889,2011
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 overlap Dirac operator at both zero and nonzero baryon density. Krylov-R
Externí odkaz:
http://arxiv.org/abs/0912.4457
Autor:
Bloch, Jacques C. R., Heybrock, Simon
Publikováno v:
PoS LAT2009:025,2009
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 methods project the operator on a much smaller Krylov subspace, on whic
Externí odkaz:
http://arxiv.org/abs/0910.2918
Autor:
Bloch, Jacques C. R., Breu, Tobias, Frommer, Andreas, Heybrock, Simon, Schäfer, Katrin, Wettig, Tilo
Publikováno v:
PoS LAT2009:043,2009
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 with restarts. Together with deflation we obtain efficient iterative met
Externí odkaz:
http://arxiv.org/abs/0910.2927
Autor:
Bloch, Jacques C. R., Breu, Tobias, Frommer, Andreas, Heybrock, Simon, Schäfer, Katrin, Wettig, Tilo
Publikováno v:
Comput.Phys.Commun.181:1378-1387,2010
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 work we introduced an Arnoldi-based Krylov subspace approximation, which
Externí odkaz:
http://arxiv.org/abs/0910.1048
Publikováno v:
Nucl.Phys. B687 (2004) 76-100
We perform numerical studies of the running coupling constant alpha_R(p^2) and of the gluon and ghost propagators for pure SU(2) lattice gauge theory in the minimal Landau gauge. Different definitions of the gauge fields and different gauge-fixing pr
Externí odkaz:
http://arxiv.org/abs/hep-lat/0312036
We present a numerical study of the running coupling constant and of the gluon and ghost propagators in minimal Landau gauge. Simulations are done in pure SU(2) lattice gauge theory for several values of beta and lattice sizes. We use two different l
Externí odkaz:
http://arxiv.org/abs/hep-lat/0209040
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