Physics – High Energy Physics – High Energy Physics - Theory
Scientific paper
1996-11-28
J.Math.Phys. 38 (1997) 3209-3229
Physics
High Energy Physics
High Energy Physics - Theory
31 pages, RevTeX, typos corrected. To be published in Journal of Mathematical Physics
Scientific paper
10.1063/1.532042
The character problems of SU(2) and SU(1,1) are reexamined from the standpoint of a physicist by employing the Hilbert space method which is shown to yield a completely unified treatment for SU(2) and the discrete series of representations of SU(1,1). For both the groups the problem is reduced to the evaluation of an integral which is invariant under rotation for SU(2) and Lorentz transformation for SU(1,1). The integrals are accordingly evaluated by applying a rotation to a unit position vector in SU(2) and a Lorentz transformation to a unit SO(2,1) vector which is time-like for the elliptic elements and space-like for the hyperbolic elements in SU(1,1). The details of the procedure for the principal series of representations of SU(1,1) differ substantially from those of the discrete series.
Bal Subrata
Basu Debabrata
Shajesh K. V.
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