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Unitary Representations of the Homogeneous Lorentz Group in an O(1,1)⊗O(2) Basis and Some Applications to Relativistic Equations
Author(s) -
E. G. Kalnins
Publication year - 1972
Publication title -
journal of mathematical physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.708
H-Index - 119
eISSN - 1089-7658
pISSN - 0022-2488
DOI - 10.1063/1.1666136
Subject(s) - lorentz group , lorentz transformation , unitary state , group (periodic table) , mathematics , mathematical physics , unitary group , representation theory of the lorentz group , basis (linear algebra) , homogeneous , invariant (physics) , lorentz covariance , irreducible representation , pure mathematics , dirac (video compression format) , matrix (chemical analysis) , physics , quantum mechanics , combinatorics , lie algebra , geometry , fundamental representation , neutrino , political science , law , weight , materials science , composite material
Unitary irreducible representations of the homogeneous Lorentz group O(3, 1) belonging to the principal series are reduced with respect to the subgroup O(1,1) O(2). As an application we determine the mixed basis matrix elements between O(3) and O(1,1) O(2) bases and derive recurrence relations for them. This set of functions is then used to obtain invariant expansions of solutions of the Dirac and Proca free field equations. These expansions are shown to have the correct nonrelativistic limit

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