| speaker: | Volker Dohm Aachen University |
| time: | Friday, November 16, 09:55 - 10:20 |
The notion of a universality class of critical behavior is reviewed and the range of validity of two-scale factor universality is discussed. There exist two sources of nonuniversality that cause a certain degree of diversity of critical behavior within a given universality class: spatial anisotropy of non-cubic symmetry and subleading long-range interactions of the van der Waals type. These sources do not affect the scaling functions of bulk thermodynamic quantities but they affect both the finite-size scaling functions and the bulk correlation functions. Quantitative predictions of the anisotropic φ4 theory are presented and compared with recent Monte Carlo simulations.