Critical exponents for the homology of Fortuin-Kasteleyn clusters on a torus.
A Fortuin-Kasteleyn cluster on a torus is said to be of type {a,b},a,b in Z , if it is possible to draw a curve belonging to the cluster that winds a times around the first cycle of the torus as it winds -b times around the second. Even though the Q -Potts models make sense only for Q integers, they can be included into a family of models parametrized by beta = square root of Q for which the Fortuin-Kasteleyn clusters can be defined for any real beta(0,2] . For this family, we study the probability pi({a,b}) of a given type of clusters as a function of the torus modular parameter tau=tau(r)+itau(i). We compute the asymptotic behavior of some of these probabilities as the torus becomes infinitely thin. For example, the behavior of pi({1,0}) is studied for tau(i) --> infinity . Exponents describing these behaviors are defined and related to weights h(r,s) of the extended Kac table for r and s integers, but also half-integers. Numerical simulations are also presented. Possible relationship with recent works and conformal loop ensembles is discussed.
Morin-Duchesne
Alexi
A
Département de Physique, Université de Montréal, CP 6128, succ. Centre-ville, Montréal, Québec, Canada H3C 3J7. alexi.morin-duchesne@umontreal.ca
Saint-Aubin
Yvan
Y