Physics – Mathematical Physics
Scientific paper
2002-05-09
Hadronic J. 25 (2002) 481-508
Physics
Mathematical Physics
20 pages, LaTeX2e
Scientific paper
A double covering of the proper orthochronous Lorentz group is understood as a complexification of the special unimodular group of second order (a double covering of the 3-dimensional rotation group). In virtue of such an interpretation the matrix elements of finite-dimensional representations of the Lorentz group are studied in terms of hyperspherical functions. Different forms of the hyperspherical functions related to other special functions (hypergeometric series, generalized spherical functions, Jacobi functions, Appell functions) are considered. It is shown that there is a close relationship between hyperspherical functions and physical fields defined within $(j,0)\oplus(0,j)$ representation spaces. Recurrence relations between hyperspherical functions are given.
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