arXiv subjects

St. Thurner

Publications and source records attributed to St. Thurner.

3 recordsLinked to original sources

arXiv1996

Correlation functions between topological objects -- field theoretic versus geometric definitions

We analyze topological objects in pure gluonic $SU(2)$ lattice gauge theory and compute correlation functions between instantons and monopoles. Concerning the instantons we use geometric and field theoretic definitions of the topological charge. On a $12^3\times 4$ lattice it turns out that topological quantities have a non-trivial local correlation. The auto-correlation functions of the topological charge depend on cooling for both definitions. We fit the correlation functions to exponentials and obtain screening masses.

hep-lat↗

arXiv1996

Visualization of topological objects in QCD

Recently evidence appeared that instantons and monopoles have a certain local correlation in four-dimensional pure $SU(2)$ and $SU(3)$ gauge theory. We visualize several specific gauge field configurations and show directly that there is an enhanced probability for finding maximally projected abelian monopole loops in the vicinity of instantons. This feature is independent of the topological charge definition used.

hep-lat↗

arXiv1995

Correlations between Quarks, Monopoles and Instantons

We analyze topological objects in pure QCD in the presence of external quarks by calculating the distributions of instanton and monopole densities around static color sources. We find a suppression of the densities close to external sources and the formation of a flux tube between a static quark--antiquark pair. The similarity in the behavior of instantons and monopoles around static sources might be due to a local correlation between these topological objects. On an $8^{3} \times 4$ lattice at $β=5.6$, it turns out that topological quantities are correlated approximately two lattice spacings.

hep-th↗