Two-point Padé approximants that interpolate weak- and strong-coupling expansions produce accurate global approximations to the two-point correlation function in lattice φ⁴ theory over wide coupling ranges.
The convergence is not uniform: WCE-1Pad´ e slows down as ˜gincreases, whereas SCE-1Pad´ e slows down as ˜g→0
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Strong-coupling expansion and two-point Pad\'e approximation for lattice $\phi^4$ field theory
Two-point Padé approximants that interpolate weak- and strong-coupling expansions produce accurate global approximations to the two-point correlation function in lattice φ⁴ theory over wide coupling ranges.