arXiv subjects

Beat Jegerlehner

Publications and source records attributed to Beat Jegerlehner.

4 recordsLinked to original sources

arXiv1997

Critical Behavior at the Chiral Phase Transition

Quantum chromodynamics with two zero mass flavors is expected to exhibit a phase transition with O(4) critical behavior. Fixing the universality class is important for phenomenology and for facilitating the extrapolation of simulation data to physical quark mass values. At Lattice '96 the Tsukuba and Bielefeld groups reported results from new simulations with dynamical staggered quarks at $N_t = 4$, which suggested a departure from the expected critical behavior. We report observations of similar deviations and discuss efforts in progress to understand this phenomenon.

hep-lat↗

arXiv1996

Some aspects of simulation algorithms for dynamical fermions

Three topics concerning fermion simulation algorithms are discussed: 1.) A performance comparison of the multiboson technique to simulate dynamical fermions and the Kramers equation algorithm, 2.) the question of reversibility in the Hybrid Monte Carlo algorithm and 3.) the implementation of Symanzik's improvement program for dynamical Wilson fermions.

hep-lat↗

arXiv1995

Performance Tests of the Kramers Equation and Boson Algorithms for Simulations of QCD

We present a performance comparison of the Kramers equation and the boson algorithms for simulations of QCD with two flavors of dynamical Wilson fermions and gauge group $SU(2)$. Results are obtained on $6^312$, $8^312$ and $16^4$ lattices. In both algorithms a number of optimizations are installed.

hep-lat↗

arXiv1995

Improvements of Lüscher's local bosonic fermion algorithm

We discuss the application of hybrid over-relaxation, even-odd preconditioning and a modified local updating procedure to the local bosonic fermion algorithm. Studies on autocorrelation times and the tuning of the parameters of the algorithm are done on various lattice sizes simulating SU(2)-LGT with 2 flavours of Wilson quarks. A substantial decrease of the computational cost could be achieved.

hep-lat↗