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- W2073490523 abstract "A recent proof of the convergence of the optimized $ensuremath{delta}$ expansion for one-dimensional non-Gaussian integrals is extended to the finite-temperature partition function of the quantum anharmonic oscillator. The convergence is exponentially fast, with the remainder falling as ${e}^{ensuremath{-}c{N}^{frac{2}{3}}}$ at order $N$ in the expansion, independently of the size of the coupling or the sign of the mass term. In particular, the approach gives a convergent resummation procedure for the double-well (non-Borel-summable) case." @default.
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- W2073490523 date "1993-03-15" @default.
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- W2073490523 title "Convergence proof for optimized<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML display=inline><mml:mi>δ</mml:mi></mml:math>expansion: Anharmonic oscillator" @default.
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- W2073490523 doi "https://doi.org/10.1103/physrevd.47.2560" @default.
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