Extrapolation from hypergeometric functions, continued functions and Borel-Leroy transformation; Resummation of perturbative renormalization functions from field theories

Abstract

Physically relevant field-theoretic quantities are usually derived from perturbation techniques. These quantities are solved in the form of an asymptotic series in powers of small perturbation parameters related to the physical system, and calculating higher powers typically results in a higher amount of computational complexity. Such divergent expansions were handled using hyper-geometric functions, continued functions, and Borel-Leroy transforms. Hypergeometric functions are expanded as series, and a rough estimate of next-order information is predicted using information from known orders. Continued functions are used for the resummation of these series. The effective nature of extrapolation using such functions is illustrated by taking different examples in field theories. In the vicinity of second-order phase transitions, critical exponents are the most interesting numerical quantities corresponding to a wide range of physical systems. Using the techniques mentioned in this work, precise estimates are obtained for these critical exponents in ϕ^4 and ϕ^3 field models.

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