Superselection rules induced by infrared divergence

  • Superselection rules induced by the interaction with a mass zero Boson field are investigated for a class of exactly soluble Hamiltonian models. The calculations apply as well to discrete as to continuous superselection rules. The initial state (reference state) of the Boson field is either a normal state or a KMS state. The superselection sectors emerge if and only if the Boson field is infrared divergent, i. e. the bare photon number diverges and the ground state of the Boson field disappears in the continuum. The time scale of the decoherence depends on the strength of the infrared contributions of the interaction and on properties of the initial state of the Boson system. These results are first derived for a Hamiltonian with conservation laws. But in the most general case the Hamiltonian includes an additional scattering potential, and the only conserved quantity is the energy of the total system. The superselection sectors remain stable against the perturbation by the scattering processes.

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Metadaten
Verfasserangaben:Joachim Kupsch
URN (Permalink):urn:nbn:de:hbz:386-kluedo-13666
Dokumentart:Arbeitspapier
Sprache der Veröffentlichung:Englisch
Jahr der Fertigstellung:2004
Jahr der Veröffentlichung:2004
Veröffentlichende Institution:Technische Universität Kaiserslautern
Datum der Publikation (Server):02.02.2005
Freies Schlagwort / Tag:Mathematical Physics
Fachbereiche / Organisatorische Einheiten:Fachbereich Physik
DDC-Sachgruppen:5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik
Lizenz (Deutsch):Standard gemäß KLUEDO-Leitlinien vor dem 27.05.2011

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