Test of renormalization predictions for universal finite-size scaling functions

Details Test of renormalization predictions for universal finite-size scaling functions Test of renormalization predictions for universal finite-size scaling functions

1999-11-02

arxiv.org/abs/cond-mat/9911005v1

Phys. Rev. E 60, 7558 (1999)

Physics

Condensed Matter

Statistical Mechanics

6 pages, including 3 EPS figures. To appear in Phys. Rev. E. Also available as PDF file at http://www.cond-mat.physik.uni-ma

Scientific paper

10.1103/PhysRevE.60.7558

We calculate universal finite-size scaling functions for systems with an n-component order parameter and algebraically decaying interactions. Just as previously has been found for short-range interactions, this leads to a singular epsilon-expansion, where epsilon is the distance to the upper critical dimension. Subsequently, we check the results by numerical simulations of spin models in the same universality class. Our systems offer the essential advantage that epsilon can be varied continuously, allowing an accurate examination of the region where epsilon is small. The numerical calculations turn out to be in striking disagreement with the predicted singularity.

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