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Symmetry, Integrability and Geometry: Methods and Applications, 2010, Volume 6, 079, 23 pp.
DOI: https://doi.org/10.3842/SIGMA.2010.079
(Mi sigma537)
 

This article is cited in 2 scientific papers (total in 2 papers)

Non-Perturbative Asymptotic Improvement of Perturbation Theory and Mellin–Barnes Representation

Samuel Friota, David Greynatb

a Univ Paris-Sud, Institut de Physique Nucléaire, UMR 8608, Orsay, F-91405, France
b Institut de Física Altes Energies, Universitat Autònoma de Barcelona, E-08193 Bellaterra, Barcelona, Spain
Full-text PDF (374 kB) Citations (2)
References:
Abstract: Using a method mixing Mellin–Barnes representation and Borel resummation we show how to obtain hyperasymptotic expansions from the (divergent) formal power series which follow from the perturbative evaluation of arbitrary "$N$-point" functions for the simple case of zero-dimensional $\phi^4$ field theory. This hyperasymptotic improvement appears from an iterative procedure, based on inverse factorial expansions, and gives birth to interwoven non-perturbative partial sums whose coefficients are related to the perturbative ones by an interesting resurgence phenomenon. It is a non-perturbative improvement in the sense that, for some optimal truncations of the partial sums, the remainder at a given hyperasymptotic level is exponentially suppressed compared to the remainder at the preceding hyperasymptotic level. The Mellin–Barnes representation allows our results to be automatically valid for a wide range of the phase of the complex coupling constant, including Stokes lines. A numerical analysis is performed to emphasize the improved accuracy that this method allows to reach compared to the usual perturbative approach, and the importance of hyperasymptotic optimal truncation schemes.
Keywords: exactly and quasi-exactly solvable models; Mellin–Barnes representation; hyperasymptotics; resurgence; non-perturbative effects; field theories in lower dimensions.
Received: June 9, 2010; in final form September 30, 2010; Published online October 7, 2010
Bibliographic databases:
Document Type: Article
MSC: 41A60; 30E15
Language: English
Citation: Samuel Friot, David Greynat, “Non-Perturbative Asymptotic Improvement of Perturbation Theory and Mellin–Barnes Representation”, SIGMA, 6 (2010), 079, 23 pp.
Citation in format AMSBIB
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\by Samuel Friot, David Greynat
\paper Non-Perturbative Asymptotic Improvement of Perturbation Theory and Mellin--Barnes Representation
\jour SIGMA
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\vol 6
\papernumber 079
\totalpages 23
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  • This publication is cited in the following 2 articles:
    Citing articles in Google Scholar: Russian citations, English citations
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