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### Effective density of states for a quantum oscillator coupled to a photon field

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Betz, Volker and Castrigiano, Domenico P. L..
(2011)
*Effective density of states for a quantum oscillator coupled to a photon field.*
Communications in Mathematical Physics, Volume 301
(Number 3).
pp. 811-839.
ISSN 0010-3616

**Full text not available from this repository.**

Official URL: http://dx.doi.org/10.1007/s00220-010-1167-8

## Abstract

We give an explicit formula for the effective partition function of a harmonically bound particle minimally coupled to a photon field in the dipole approximation. The effective partition function is shown to be the Laplace transform of a positive Borel measure, the effective measure of states. The absolutely continuous part of the latter allows for an analytic continuation, the singularities of which give rise to resonances. We give the precise location of these singularities, and show that they are well approximated by first order poles with residues equal to the multiplicities of the corresponding eigenspaces of the uncoupled quantum oscillator. Thus we obtain a complete analytic description of the natural line spectrum of the charged oscillator.

Item Type: | Journal Article |
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Subjects: | Q Science > QC Physics |

Divisions: | Faculty of Science > Mathematics |

Library of Congress Subject Headings (LCSH): | Harmonic oscillators, Quantum field theory, Hamiltonian systems |

Journal or Publication Title: | Communications in Mathematical Physics |

Publisher: | Springer |

ISSN: | 0010-3616 |

Official Date: | 2011 |

Volume: | Volume 301 |

Number: | Number 3 |

Page Range: | pp. 811-839 |

Identification Number: | 10.1007/s00220-010-1167-8 |

Status: | Peer Reviewed |

Publication Status: | Published |

Funder: | Engineering and Physical Sciences Research Council (EPSRC) |

Grant number: | EP/D07181X/1 (EPSRC) |

References: | 1. Bach, V., Fröhlich, J., Sigal, I.M.: Quantum Electrodynamics of Conﬁned Nonrelativistic Particles. Adv. |

URI: | http://wrap.warwick.ac.uk/id/eprint/41674 |

Data sourced from Thomson Reuters' Web of Knowledge

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