Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2005-11-07
JHEP 0603 (2006) 017
Physics
High Energy Physics
High Energy Physics - Lattice
28 pages, 8 figures
Scientific paper
10.1088/1126-6708/2006/03/017
We explore gauge actions for lattice QCD, which are constructed such that the occurrence of small plaquette values is strongly suppressed. By choosing strong bare gauge couplings we arrive at values for the physical lattice spacings of O(0.1 fm). Such gauge actions tend to confine the Monte Carlo history to a single topological sector. This topological stability facilitates the collection of a large set of configurations in a specific sector, which is profitable for numerical studies in the epsilon-regime. The suppression of small plaquette values is also expected to be favourable for simulations with dynamical quarks. We use a local Hybrid Monte Carlo algorithm to simulate such actions, and we present numerical results for the static potential, the physical scale, the topological stability and the kernel condition number of the overlap Dirac operator. In addition we discuss the question of reflection positivity for a class of such gauge actions.
Bietenholz Wolfgang
Jansen Karl
Nagai K.-I.
Necco Silvia
Scorzato Luigi
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