Examples of overlapping convergent expansions of scaling variables

Details Examples of overlapping convergent expansions of scaling variables Examples of overlapping convergent expansions of scaling variables

2000-07-25

arxiv.org/abs/hep-lat/0007037v1

Physics

High Energy Physics

High Energy Physics - Lattice

30 pages, 22 figures, uses revtex

Scientific paper

We construct series expansions for the scaling variables (which transform multiplicatively under a renormalization group (RG) transformation) in examples where the RG flows, going from an unstable (Wilson's) fixed point to a stable (high-temperature) fixed point, can be calculated numerically. The examples are Dyson's hierarchical model and a simplified version of it. We provide numerical evidence that the scaling variables about the two fixed points have overlapping domain of convergence. We show how quantities such as the magnetic susceptibility can be expressed in terms of these variables. This procedure provide accurate analytical expressions both in the critical and high-temperature region.

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