dorsal/arxiv
View SchemaA differential method for bounding the ground state energy
| Authors | Amaury Mouchet |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0412121 |
| URL | https://arxiv.org/abs/quant-ph/0412121 |
| DOI | 10.1088/0305-4470/38/5/006 |
| Journal | Journal of Physics A 38 (2005) 1039 |
Abstract
For a wide class of Hamiltonians, a novel method to obtain lower and upper bounds for the lowest energy is presented. Unlike perturbative or variational techniques, this method does not involve the computation of any integral (a normalisation factor or a matrix element). It just requires the determination of the absolute minimum and maximum in the whole configuration space of the local energy associated with a normalisable trial function (the calculation of the norm is not needed). After a general introduction, the method is applied to three non-integrable systems: the asymmetric annular billiard, the many-body spinless Coulombian problem, the hydrogen atom in a constant and uniform magnetic field. Being more sensitive than the variational methods to any local perturbation of the trial function, this method can used to systematically improve the energy bounds with a local skilled analysis; an algorithm relying on this method can therefore be constructed and an explicit example for a one-dimensional problem is given.
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"abstract": "For a wide class of Hamiltonians, a novel method to obtain lower and upper\nbounds for the lowest energy is presented. Unlike perturbative or variational\ntechniques, this method does not involve the computation of any integral (a\nnormalisation factor or a matrix element). It just requires the determination\nof the absolute minimum and maximum in the whole configuration space of the\nlocal energy associated with a normalisable trial function (the calculation of\nthe norm is not needed). After a general introduction, the method is applied to\nthree non-integrable systems: the asymmetric annular billiard, the many-body\nspinless Coulombian problem, the hydrogen atom in a constant and uniform\nmagnetic field. Being more sensitive than the variational methods to any local\nperturbation of the trial function, this method can used to systematically\nimprove the energy bounds with a local skilled analysis; an algorithm relying\non this method can therefore be constructed and an explicit example for a\none-dimensional problem is given.",
"arxiv_id": "quant-ph/0412121",
"authors": [
"Amaury Mouchet"
],
"categories": [
"quant-ph",
"math.SP",
"nlin.CD"
],
"doi": "10.1088/0305-4470/38/5/006",
"journal_ref": "Journal of Physics A 38 (2005) 1039",
"title": "A differential method for bounding the ground state energy",
"url": "https://arxiv.org/abs/quant-ph/0412121"
},
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