dorsal/arxiv
View SchemaResummation of the Divergent Perturbation Series for a Hydrogen Atom in an Electric Field
| Authors | U. D. Jentschura |
|---|---|
| Categories | |
| ArXiv ID | physics/0010038 |
| URL | https://arxiv.org/abs/physics/0010038 |
| DOI | 10.1103/PhysRevA.64.013403 |
| Journal | Phys.Rev. A64 (2001) 013403 |
Abstract
We consider the resummation of the perturbation series describing the energy displacement of a hydrogenic bound state in an electric field (known as the Stark effect or the LoSurdo-Stark effect), which constitutes a divergent formal power series in the electric field strength. The perturbation series exhibits a rich singularity structure in the Borel plane. Resummation methods are presented which appear to lead to consistent results even in problematic cases where isolated singularities or branch cuts are present on the positive and negative real axis in the Borel plane. Two resummation prescriptions are compared: (i) a variant of the Borel-Pade resummation method, with an additional improvement due to utilization of the leading renormalon poles (for a comprehensive discussion of renormalons see [M. Beneke, Phys. Rep. vol. 317, p. 1 (1999)]), and (ii) a contour-improved combination of the Borel method with an analytic continuation by conformal mapping, and Pade approximations in the conformal variable. The singularity structure in the case of the LoSurdo-Stark effect in the complex Borel plane is shown to be similar to (divergent) perturbative expansions in quantum chromodynamics.
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"abstract": "We consider the resummation of the perturbation series describing the energy\ndisplacement of a hydrogenic bound state in an electric field (known as the\nStark effect or the LoSurdo-Stark effect), which constitutes a divergent formal\npower series in the electric field strength. The perturbation series exhibits a\nrich singularity structure in the Borel plane. Resummation methods are\npresented which appear to lead to consistent results even in problematic cases\nwhere isolated singularities or branch cuts are present on the positive and\nnegative real axis in the Borel plane. Two resummation prescriptions are\ncompared: (i) a variant of the Borel-Pade resummation method, with an\nadditional improvement due to utilization of the leading renormalon poles (for\na comprehensive discussion of renormalons see [M. Beneke, Phys. Rep. vol. 317,\np. 1 (1999)]), and (ii) a contour-improved combination of the Borel method with\nan analytic continuation by conformal mapping, and Pade approximations in the\nconformal variable. The singularity structure in the case of the LoSurdo-Stark\neffect in the complex Borel plane is shown to be similar to (divergent)\nperturbative expansions in quantum chromodynamics.",
"arxiv_id": "physics/0010038",
"authors": [
"U. D. Jentschura"
],
"categories": [
"physics.atom-ph",
"hep-ph",
"quant-ph"
],
"doi": "10.1103/PhysRevA.64.013403",
"journal_ref": "Phys.Rev. A64 (2001) 013403",
"title": "Resummation of the Divergent Perturbation Series for a Hydrogen Atom in an Electric Field",
"url": "https://arxiv.org/abs/physics/0010038"
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