Abstract
We improve and generalize in several accounts the recent rigorous proof of convergence of delta expansion-order dependent mappings (variational perturbation expansion) for the energy eigenvalues of quartic anharmonic oscillator. For the single-well oscillator the uniformity of convergence in g∈[0, ∞] is proven. The convergence proof is extended also to complex values of g lying on a wide domain of the Riemann surface of E(g). Via the scaling relation à la Symanzik, this proves the convergence of delta expansion for the double well in the strong coupling regime (where the standard perturbation series is non Borel summable), as well as for the complex "energy eigenvalues" in certain metastable systems. Difficulties in extending the convergence proof to the cases of higher anharmonic oscillators are pointed out. Sufficient conditions for the convergence of delta expansion are summarized in the form of three general theorems, which should apply to a wide class of quantum mechanical and higher dimensional field theoretic systems.
| Original language | English |
|---|---|
| Pages (from-to) | 109-145 |
| Number of pages | 37 |
| Journal | Annals of Physics |
| Volume | 249 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - Jul 10 1996 |
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All Science Journal Classification (ASJC) codes
- Physics and Astronomy(all)
Cite this
Improved convergence proof of the delta expansion and order dependent mappings. / Guida, Riccardo; Konishi, Kenichi; Suzuki, Hiroshi.
In: Annals of Physics, Vol. 249, No. 1, 10.07.1996, p. 109-145.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Improved convergence proof of the delta expansion and order dependent mappings
AU - Guida, Riccardo
AU - Konishi, Kenichi
AU - Suzuki, Hiroshi
PY - 1996/7/10
Y1 - 1996/7/10
N2 - We improve and generalize in several accounts the recent rigorous proof of convergence of delta expansion-order dependent mappings (variational perturbation expansion) for the energy eigenvalues of quartic anharmonic oscillator. For the single-well oscillator the uniformity of convergence in g∈[0, ∞] is proven. The convergence proof is extended also to complex values of g lying on a wide domain of the Riemann surface of E(g). Via the scaling relation à la Symanzik, this proves the convergence of delta expansion for the double well in the strong coupling regime (where the standard perturbation series is non Borel summable), as well as for the complex "energy eigenvalues" in certain metastable systems. Difficulties in extending the convergence proof to the cases of higher anharmonic oscillators are pointed out. Sufficient conditions for the convergence of delta expansion are summarized in the form of three general theorems, which should apply to a wide class of quantum mechanical and higher dimensional field theoretic systems.
AB - We improve and generalize in several accounts the recent rigorous proof of convergence of delta expansion-order dependent mappings (variational perturbation expansion) for the energy eigenvalues of quartic anharmonic oscillator. For the single-well oscillator the uniformity of convergence in g∈[0, ∞] is proven. The convergence proof is extended also to complex values of g lying on a wide domain of the Riemann surface of E(g). Via the scaling relation à la Symanzik, this proves the convergence of delta expansion for the double well in the strong coupling regime (where the standard perturbation series is non Borel summable), as well as for the complex "energy eigenvalues" in certain metastable systems. Difficulties in extending the convergence proof to the cases of higher anharmonic oscillators are pointed out. Sufficient conditions for the convergence of delta expansion are summarized in the form of three general theorems, which should apply to a wide class of quantum mechanical and higher dimensional field theoretic systems.
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U2 - 10.1006/aphy.1996.0066
DO - 10.1006/aphy.1996.0066
M3 - Article
AN - SCOPUS:0030578337
VL - 249
SP - 109
EP - 145
JO - Annals of Physics
JF - Annals of Physics
SN - 0003-4916
IS - 1
ER -