Physics – High Energy Physics – High Energy Physics - Lattice
Scientific paper
2011-11-17
Physics
High Energy Physics
High Energy Physics - Lattice
6 pages, 6 EPS figures, Poster presented at The XXIX International Conference on Lattice Field Theory - Lattice 2011, July 10-
Scientific paper
We present direct representations of the scaling functions of the 3d O(4) model which are relevant for comparisons to other models, in particular QCD. This is done in terms of expansions in the scaling variable z=t/h^{1/\beta\delta}. The expansions around z=0 and the corresponding asymptotic ones for z --> +/- infty, overlap such that no interpolation is needed. We explicitly present the expansion coefficients which have been determined numerically from data of a previous high statistics simulation of the O(4) model on a three-dimensional lattice of linear extension L=120. This allows to derive smooth representations of the first three derivatives of the scaling function of the free energy density, which determine universal properties of up to sixth order cumulants of net charge fluctuations in QCD.
Engels Juergen
Karsch Frithjof
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