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Non-Borel summable Phi4 theory in zero dimension: A toy model for testing numerical and analytical methods

J. Math. Phys. 49, 043509 (2008); doi:10.1063/1.2903750

Published 8 April 2008

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M. Marucho
Department of Chemistry, University of Houston, Houston, Texas 77204-5003, USA
The exact analytical solution for the generating functional of the zero-dimensional Phi4 theory with degenerate minima is obtained in the whole complex coupling parameter plane for testing purposes. The efficiency and precision of different computing tools, proposed in non-Borel summable field theories to obtain approximate solutions in both perturbative and nonperturbative regimes, are analyzed. Furthermore, a new resummation approach is proposed in order to successfully deal with factorially divergent series. It provides a representation of the generating function in terms of an unambiguously defined Laplace–Borel integral. On the other hand, a recent approach called the generalized Borel transform is shown to be an accurate and robust technique to capture non perturbative contributions in the coupling parameter. An extension of this approach to path integrals is proposed. ©2008 American Institute of Physics
History: Received 9 January 2008; accepted 5 March 2008; published 8 April 2008
Permalink: http://link.aip.org/link/?JMAPAQ/49/043509/1
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KEYWORDS and PACS

Keywords
PACS
  • 11.10.Cd
    Axiomatic approach in field theory
  • 02.30.Rz
    Integral equations
  • YEAR: 2008

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0022-2488 (print)   1089-7658 (online)
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