Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
2004-10-14
JHEP0412:022,2004
Physics
High Energy Physics
High Energy Physics - Theory
21 pages, no figures, uses JHEP3.cls
Scientific paper
10.1088/1126-6708/2004/12/022
The k-string tensions are explored in the 4-d $[U(1)]^{N-1}$-invariant dual Abelian-Higgs-type theory. In the London limit of this theory, the Casimir scaling is found in the approximation when small-sized closed dual strings are disregarded. When these strings are treated in the dilute-plasma approximation, explicit corrections to the Casimir scaling are found. The leading correction due to the deviation from the London limit is also derived. Its N-ality dependence turns out to be the same as that of the first non-trivial correction produced by closed strings. It also turns out that this N-ality dependence coincides with that of the leading correction to the k-string tension, which emerges by way of the non-diluteness of the monopole plasma in the 3-d SU(N) Georgi-Glashow model. Finally, we prove that, in the latter model, Casimir scaling holds even at monopole densities close to the mean one, provided the string world sheet is flat.
Antonov Dmitri
Debbio Luigi Del
Ebert Dietmar
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