Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2006-08-12
Eur.Phys.J.C49:973-981,2007
Physics
High Energy Physics
High Energy Physics - Lattice
20 pages, 11 Figures. Minor changes in text and figures, to appear in Eur.Phys.J.C
Scientific paper
10.1140/epjc/s10052-006-0172-8
We perform a throughout study of 3+1 dim. SO(3) LGT for any fixed-twist background. We concentrate in particular on the physically significant trivial and 1-twist sectors. Introducing a Z(2) monopole chemical potential the 1st order bulk transition is moved down in the strong coupling region and weakened to 2nd order in the 4-dim Ising model universality class. In this extended phase diagram we gain access to a confined phase in every fixed twist sector of the theory. The Pisa disorder operator is employed together with the Polyakov loop to study the confinement-deconfinement transition in each sector. Due to the specific properties of both operators, most results can be used to gain insight in the ergodic theory, where all twist sectors should be summed upon. An explicit mapping of each fixed twist theory to effective positive plaquette models with fixed twisted boundary conditions is applied to better establish their properties in the different phases.
Barresi A.
Burgio Giuseppe
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