Fast summation of divergent series and resurgent transseries from Meijer- G approximants

We develop a resummation approach based on Meijer-G functions and apply it to approximate the Borel sum of divergent series and the Borel-Écalle sum of resurgent transseries in quantum mechanics and quantum field theory (QFT). The proposed method is shown to vastly outperform the conventional Borel-...

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Bibliographic Details
Published in:Physical review. D 2018-05, Vol.97 (10), Article 105027
Main Authors: Mera, Héctor, Pedersen, Thomas G., Nikolić, Branislav K.
Format: Article
Language:English
Subjects:
Anharmonicity
Approximants
Field theory
Quantum field theory
Quantum mechanics
Quantum physics
Quantum theory
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Summary:We develop a resummation approach based on Meijer-G functions and apply it to approximate the Borel sum of divergent series and the Borel-Écalle sum of resurgent transseries in quantum mechanics and quantum field theory (QFT). The proposed method is shown to vastly outperform the conventional Borel-Padé and Borel-Padé-Écalle summation methods. The resulting Meijer-G approximants are easily parametrized by means of a hypergeometric ansatz and can be thought of as a generalization to arbitrary order of the Borel-hypergeometric method [Mera et al., Phys. Rev. Lett. 115, 143001 (2015)]. Here we demonstrate the accuracy of this technique in various examples from quantum mechanics and QFT, traditionally employed as benchmark models for resummation, such as zero-dimensional ϕ4 theory; the quartic anharmonic oscillator; the calculation of critical exponents for the N-vector model; ϕ4 with degenerate minima; self-interacting QFT in zero dimensions; and the summation of one- and two-instanton contributions in the quantum-mechanical double-well problem.
ISSN:2470-0010
2470-0029
DOI:10.1103/PhysRevD.97.105027