EnglishWe study the critical crossover between the Gaussian and the Wilson-Fisher fixed point for general O(N)-invariant spin models with medium-range interactions, We perform a systematic expansion around the mean-field solution, obtaining the universal crossover curves and their leading corrections, In particular we show that, in three dimensions, the leading correction scales as R(-3), R being the range of the interactions, We compare our results with the existing numerical ones obtained by Monte Carlo simulations and present a critical discussion of other approaches, (C) 1999 Elsevier Science B.V. All rights reserved.
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http://hdl.handle.net/11568/191115| Autori interni: | ROSSI, PAOLO VICARI, ETTORE |
| Autori: | Pelissetto A; Rossi P; Vicari E |
| Titolo: | Mean-field expansion for spin models with medium-range interactions |
| Anno del prodotto: | 1999 |
| Digital Object Identifier (DOI): | 10.1016/S0550-3213(99)00311-9 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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