Abelian Monopoles and Action Density in SU(2) Gluodynamics on the Lattice

We show that the extended Abelian magnetic monopoles in the Maximal Abelian projection of lattice SU(2) gluodynamics are locally correlated with the magnetic and the electric parts of the SU(2) action density. These correlations are observed in the confined and in the deconfined phases.Comment: 11 pages, LaTeX2e, 5 figures, uses epsf.sty; revision: Introduction is extended and a few references are adde

Abelian representation for nonabelian Wilson loops and the Non - Abelian Stokes theorem on the lattice

We derive the Abelian - like expression for the lattice SU(N) Wilson loop in arbitrary irreducible representation. The continuum Abelian representation of the SU(N) Wilson loop (for the loop without selfintersections) that has been obtained by Diakonov and Petrov appears to be a continuum limit of this expression. We also obtain the lattice variant of a non - Abelian Stokes theorem and present the explicit expression for the matrix $\cal H$ used in the Diakonov - Petrov approach.Comment: revtex, 10 pages, ITEP-LAT/2002-3

Multicultural Vanguard? Sarajevo’s interethnic young adults between ethnic categorisation and international spaces

This article analyses how Sarajevo’s young adults from a middle class, interethnic background deal with the rigid ethnic categorisation enforced by state institutions and society. Their strategies (exit, reframing, and partial separation) appear to be unsatisfactory to the actors themselves, and wield generally no influence on the institutions they wish to change. Three factors have been setting into motion this dynamic: first, the difficulty of escaping ethnic group thinking when attempting to reframe ethnic categories; second, the rationality of avoiding open defiance to ethnic categorisation; and third, the young adults’ tendency to centre their life on interethnic and international spaces. As a ‘project elite’, Sarajevo’s young adults are rather separated from society, both discursively and socio-economicall

LEPRASIM, an Agent-Based Model to simulate leprosy in Indonesia

Despite continuous efforts, leprosy persists locally in endemic areas including Indonesia. A cost effective method to interrupt leprosy transmission is needed to eradicate the disease completely. Agent-based Simulation models can provide a better insight in the spatio-temporal diffusion patterns of a disease, but can also be used to investigate different intervention strategies. We developed an agent-based model (LEPRASIM) to test a number of possible future long-term prevention strategies on their effectiveness. The model is applied to a case study on a group of five islands in the Flores Sea, Indonesia. Empirical data on leprosy incidence and prevalence are available for these islands as a result of a chemoprophylaxis intervention study during the period 2000-2010. The long-term effectiveness (2000-2025) of a set of eight leprosy prevention strategies, aimed at different contact groups of symptomatic patients is measured. Tests on long-term leprosy prevention strategy for the contact groups of leprosy patients using rifampicin prophylaxis revealed that the effectiveness depends on the prevalence rate. At low prevalence rate an approach aimed at household and neighbour contacts proofed to be the most effective. At high prevalence rates a blanket approach, followed by a targeted approach aimed at both household and neighbour contacts of infected individuals is the most effective option. In this study we show how Agent-based Simulation can be an effective tool for testing long term intervention strategies. The major advantage of the agent-based approach is that social contacts can be modelled directly and that the model is spatial, taking into account the distribution of people over the different islands. Although the model was developed for a specific case study, it is adjustable for other areas, including new types of social contacts and prevention strategies

Abelian monopoles in lattice gluodynamics as physical objects

By numerical calculations we show that the abelian monopole currents are locally correlated with the density of SU(2) lattice action. This fact is established for the maximal abelian projection. Thus, in the maximal abelian projection the monopoles are physical objects, they carry SU(2) action. Calculations on the asymmetric lattice show that the correlation between monopole currents and the density of SU(2) lattice action also exists in the deconfinement phase of gluodynamics.Comment: 3 pages, 2 figures, LaTeX using espcrc2.sty and epsfig.sty; Talk given by M.I. Polikarpov at the International Symposium on Lattice Field Theory, 22-26 July 1997, Edinburgh, Scotlan

Anatomy of the lattice magnetic monopoles

We study the Abelian and non-Abelian action densitynear the monopole in the maximal Abelian gauge of SU(2) lattice gauge theory. We find that the non-Abelian action density near the monopoles belonging to the percolating cluster decreases when we approach the monopole center. Our estimate of the monopole radius is R_mon ~ 0.04 fm.Comment: 9 pp., Latex2e, 2 figure (epsfig), published versio