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 WCE is asymptotic and diverges rapidly at large ˜g, while the SCE is accurate at large ˜gbut breaks 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.