Holonomy of the Ising model form-factors
Sep, 2006
Citations per year
Abstract:
We study the Ising model two-point diagonal correlation function by presenting an exponential and form factor expansion in an integral representation which differs from the known expansion of Wu, McCoy, Tracy and Barouch. We extend this expansion, weighting, by powers of a variable , the -particle contributions, . The corresponding extension of the two-point diagonal correlation function, , is shown, for arbitrary , to be a solution of the sigma form of the Painlev{\'e} VI equation introduced by Jimbo and Miwa. Linear differential equations for the form factors are obtained and shown to have both a ``Russian doll'' nesting, and a decomposition of the differential operators as a direct sum of operators equivalent to symmetric powers of the differential operator of the elliptic integral . Each is expressed polynomially in terms of the elliptic integrals and . The scaling limit of these differential operators breaks the direct sum structure but not the ``Russian doll'' structure. The previous -extensions, are, for singled-out values ( integers), also solutions of linear differential equations. These solutions of Painlev\'e VI are actually algebraic functions, being associated with modular curves.Note:
- 39 pages Subj-class: Mathematical Physics: Statistical Mechanics: Computational Physics MSC-class: 33E17, 33E05, 33Cxx, 33Dxx, 14Exx, 14Hxx, 34M55, 47E05, 34Lxx, 34Mxx, 14Kxx
- 05.50.+q
- 02.30.Gp
- 05.10.-a
- 02.30.Hq
- 02.40.Re
- 02.30.-f
- 04.20.Jb
References(41)
Figures(0)