The lambda extensions of the Ising correlation functions

Abstract

We revisit, with a pedagogical heuristic motivation, the lambda extension of the low-temperature row correlation functions of the two-dimensional Ising model. In particular, using these one-parameter series to understand the deformation theory around selected values of , namely with m and n integers, we show that these series yield perturbation coefficients, generalizing form factors, that are D-finite functions. As a by-product these exact results provide an infinite number of highly non-trivial identities on the complete elliptic integrals of the first and second kind. These results underline the fundamental role of Jacobi theta functions and Jacobi forms, the previous D-finite functions being (relatively simple) rational functions of Jacobi theta functions, when rewritten in terms of the nome of elliptic functions.