U. Glässner | Researchain

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Featured researches published by U. Glässner.

Computer Physics Communications | 1996

A Parallel SSOR preconditioner for lattice QCD

S. Fischer; Andreas Frommer; U. Glässner; Th. Lippert; G. Ritzenhöfer; K. Schilling

Abstract We present a parallelizable SSOR preconditioning scheme for Krylov subspace iterative solvers which proves to be efficient in lattice QCD applications involving Wilson fermions. Our preconditioner is based on a locally lexicographic ordering of the lattice points. In actual Hybrid Monte Carlo applications with the bi-conjugate gradient stabilized method BiCGstab, we achieve a gain factor of about 2 in the number of iterations compared to conventional odd-even preconditioning. Whether this translates into similar reductions in run time will depend on the parallel computer in use. We discuss implementation issues using the ‘Eisenstat-trick’ and machine specific advantages of the method for the APE100/Quadrics parallel computer. In a full QCD simulation on a 512-processor Quadrics QH4 we find a gain in cpu-time of a factor of 1.7 over odd-even preconditioning for a 24 3 × 40 lattice.

Physical Review D | 1998

Light and Strange Hadron Spectroscopy with Dynamical Wilson Fermions

N. Eicker; P. Lacock; K. Schilling; A. Spitz; U. Glässner; S. Güsken; H. Hoeber; Th. Lippert; Th. Struckmann; P. Ueberholz; J. Viehoff; G. Ritzenhöfer

We present the final analysis of the light and strange hadron spectra from a full QCD lattice simulation with two degenerate dynamical sea quark flavors at

Physics Letters B | 1997

Light quark masses with dynamical Wilson fermions

N. Eicker; U. Glässner; S. Güsken; H. Hoeber; P. Lacock; Th. Lippert; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff

\ensuremath{\beta}=5.6

Physics Letters B | 1996

First evidence of Nf-dependence in the QCD interquark potential

U. Glässner; S. Güsken; H. Hoeber; Th. Lippert; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; A. Wachter

on a

Physics Letters B | 1996

Evaluating sea quark contributions to flavour-singlet operators in lattice QCD

N. Eicker; U. Glässner; S. Güsken; H. Hoeber; Thomas Lippert; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff

{16}^{3}\ifmmode\times\else\texttimes\fi{}32

arXiv: High Energy Physics - Lattice | 1998

SESAM and TχL results for Wilson action—A status report

Th. Lippert; Gunnar S. Bali; N. Eicker; L. Giusti; U. Glässner; S. Güsken; H. Hoeber; P. Lacock; G. Martinelli; F. Rapuano; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff

lattice. Four sets of sea quark masses corresponding to the range

International Journal of Modern Physics C | 1996

HOW TO COMPUTE GREEN'S FUNCTIONS FOR ENTIRE MASS TRAJECTORIES WITHIN KRYLOV SOLVERS

U. Glässner; S. Güsken; Thomas Lippert; G. Ritzenhöfer; K. Schilling; Andreas Frommer

0.69l~{m}_{\ensuremath{\pi}}{/m}_{\ensuremath{\rho}}l~0.83

Physical Review B | 1994

Specific-heat exponent for the three-dimensional Ising model from a 24th-order high-temperature series.

Gyan Bhanot; Michael Creutz; U. Glässner; K. Schilling

are investigated. For reference we also ran a quenched simulation at

arXiv: High Energy Physics - Lattice | 1998

Glueballs and string breaking from full QCD

Gunnar S. Bali; N. Eicker; L. Giusti; U. Glässner; S. Guesken; H. Hoeber; P. Lacock; Thomas Lippert; Guido Martinelli; F. Rapuano; G. Ritzenhöfer; K. Schilling; G. Siegert; A. Spitz; P. Ueberholz; J. Viehoff

{\ensuremath{\beta}}_{\mathrm{eff}}=6.0,

Physical Review B | 1993