dorsal/arxiv
View SchemaQuantum-mechanical tunneling: differential operators, zeta-functions and determinants
| Authors | J. Casahorran |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0011059 |
| URL | https://arxiv.org/abs/quant-ph/0011059 |
| DOI | 10.1002/1521-3978(200203)50:3/4<405::AID-PROP405>3.0.CO;2-9 |
| Journal | Fortsch. der Phys. 50 (2002) 405-424 |
Abstract
We consider in detail the quantum-mechanical problem associated with the motion of a one-dimensional particle under the action of the double-well potential. Our main tool will be the euclidean (imaginary time) version of the path-integral method. Once we perform the Wick rotation, the euclidean equation of motion is the same as the usual one for the point particle in real time, except that the potential at issue is turned upside down. In doing so, our double-well potential becomes a two-humped potential. As required by the semiclassical approximation we may study the quadratic fluctuations over the instanton which represents in this context the localised finite-action solutions of the euclidean equation of motion. The determinants of the quadratic differential operators are evaluated by means of the zeta-function method. We write in closed form the eigenfunctions as well as the energy eigenvalues corresponding to such operators by using the shape-invariance symmetry. The effect of the multi-instantons configurations is also included in this approach.
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"abstract": "We consider in detail the quantum-mechanical problem associated with the\nmotion of a one-dimensional particle under the action of the double-well\npotential. Our main tool will be the euclidean (imaginary time) version of the\npath-integral method. Once we perform the Wick rotation, the euclidean equation\nof motion is the same as the usual one for the point particle in real time,\nexcept that the potential at issue is turned upside down. In doing so, our\ndouble-well potential becomes a two-humped potential. As required by the\nsemiclassical approximation we may study the quadratic fluctuations over the\ninstanton which represents in this context the localised finite-action\nsolutions of the euclidean equation of motion. The determinants of the\nquadratic differential operators are evaluated by means of the zeta-function\nmethod. We write in closed form the eigenfunctions as well as the energy\neigenvalues corresponding to such operators by using the shape-invariance\nsymmetry. The effect of the multi-instantons configurations is also included in\nthis approach.",
"arxiv_id": "quant-ph/0011059",
"authors": [
"J. Casahorran"
],
"categories": [
"quant-ph",
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],
"doi": "10.1002/1521-3978(200203)50:3/4\u003c405::AID-PROP405\u003e3.0.CO;2-9",
"journal_ref": "Fortsch. der Phys. 50 (2002) 405-424",
"title": "Quantum-mechanical tunneling: differential operators, zeta-functions and determinants",
"url": "https://arxiv.org/abs/quant-ph/0011059"
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