arXiv subjects

Burkhard Bunk

Publications and source records attributed to Burkhard Bunk.

4 recordsLinked to original sources

arXiv2005

Gauge theories on a five-dimensional orbifold

We present a construction of non-Abelian gauge theories on the R^4 x S^1/Z_2 orbifold. We show that no divergent boundary mass term for the Higgs field, identified with some of the fifth dimensional components of the gauge field, is generated. The formulation of the theories on the lattice requires only Dirichlet boundary conditions that specify the breaking of the gauge group. The first simulations in order to resolve the issue whether these theories can be used at low energy as weakly interacting effective theories have been performed. In case of a positive answer, these theories could provide us with a new framework for studying electroweak symmetry breaking.

hep-lat↗

arXiv1997

Topological sectors and the pion mass

We study quenched and dynamical pion correlators in the two-flavour Schwinger model (2D QED) both within topological charge sectors and averaged. The results show that a clean-cut definition of a pion mass is no longer possible if tunneling between sectors does not occur. PACS numbers: 11.15.Ha, 12.20.-m, 11.10.Kk

hep-lat↗

arXiv1997

Local bosonic versus HMC --- a CPU cost comparison

We compare the CPU cost of HMC to various implementations of the Hermitean variant of Lüscher's local bosonic algorithm (LBA) for 2D massive QED with two flavours of Wilson fermions. We carefully scan a 3-dimensional parameter subspace and find flat behaviour around the optimum. The gain factor of the LBA, as compared to HMC, is slightly smaller for the Re-weighting method than for the Metropolis variants and estimated to about 3.3 for the plaquette and 1.9 for the the meson correlator.

hep-lat↗

arXiv1996

Two-flavour Schwinger model with dynamical fermions in the Lüscher formalism

We report preliminary results for 2D massive QED with two flavours of Wilson fermions, using the Hermitean variant of Lüscher's bosonization technique. The chiral condensate and meson masses are obtained. The simplicity of the model allows for high statistics simulations close to the chiral and continuum limit, both in the quenched approximation and with dynamical fermions.

hep-lat↗