Lattice2010

Session

Parallel 42: Algorithms and machines

17 Jun 2010, 16:40

Villasimius, Sardinia

277. Rational Domain-Decomposed HMC

Yoshifumi Nakamura (University of Regensburg)

17/06/2010, 16:40

Algorithms and machines

Test results for a Hybrid Monte Carlo (HMC) algorithm combined the Domain-Decomposed HMC algorithm and the Rational HMC algorithm are presented.

78. A worm-inspired algorithm for the simulation of Abelian gauge theories

Tomasz Korzec (HU Berlin)

17/06/2010, 17:00

Algorithms and machines

We present an algorithm in which the all-order strong coupling expansion of the Abelian U(1) gauge theory with Wilson plaquette action is sampled . In addition to the vacuum closed surface graphs of the partition function we propose to also allow for a class of defects (boundaries) related to Wilson loops in the ensemble. The efficiency of our scheme in estimating various observables is...

332. The three-dimensional XY model at finite chemical potential using complex Langevin dynamics

Frank James (Swansea University)

17/06/2010, 17:20

Algorithms and machines

The three-dimensional XY model is studied at finite chemical potential using complex Langevin dynamics. The validity of the approach is probed at small chemical potential using imaginary chemical potential and continuity arguments, and at larger chemical potential by comparison with the world line method. While complex Langevin works for larger beta, we find that it fails for smaller beta,...

145. Implementation and performance optimization of Lattice QCD Tool Kit on the Cell/B.E.

Shinji Motoki (Graduate School of BioSphere Science Hiroshima University)

17/06/2010, 17:40

Algorithms and machines

We report an implementation and an efficient DMA transfer for SU(3) matrix-matrix and matrix-vector multiplication on Cell/B.E., which is a part of our project, Lattice Tool Kit on the Cell/B.E.. Last year, we reported results on QS20. After that we found the measured execution time is wrong because values on a resistor are distorted at the first measurement. The actual speed of the matrix...