What happens to spin during the SO(3)->SE(2) contraction? (On spin and extended structures in quantum mechanics)

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dc.creatorCzachor, M.
dc.creatorPosiewnik, A.
dc.date1995-01-18
dc.date.accessioned2026-07-07T06:13:30Z
dc.date.available2026-07-07T06:13:30Z
dc.descriptionIt is shown that the spin operator can be described by an algebra which is in between so(3) and e(2). Relativistic version of the singlet state for two Dirac electrons is discussed. It is shown that a measure of massless particle's extension can be naturally constructed and that this measure corresponds at the classical level to the radius of the Robinson congruence.
dc.description6 pages, REVTeX
dc.identifierhttps://arxiv.org/abs/quant-ph/9501017
dc.identifierhttp://arxiv.org/abs/quant-ph/9501017
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/93128
dc.subjectQuantum Physics
dc.titleWhat happens to spin during the SO(3)->SE(2) contraction? (On spin and extended structures in quantum mechanics)
dc.typetext

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