1. CJM 1999 (vol 51 pp. 96)
|Partial Characters and Signed Quotient Hypergroups |
If $G$ is a closed subgroup of a commutative hypergroup $K$, then the coset space $K/G$ carries a quotient hypergroup structure. In this paper, we study related convolution structures on $K/G$ coming from deformations of the quotient hypergroup structure by certain functions on $K$ which we call partial characters with respect to $G$. They are usually not probability-preserving, but lead to so-called signed hypergroups on $K/G$. A first example is provided by the Laguerre convolution on $\left[ 0,\infty \right[$, which is interpreted as a signed quotient hypergroup convolution derived from the Heisenberg group. Moreover, signed hypergroups associated with the Gelfand pair $\bigl( U(n,1), U(n) \bigr)$ are discussed.
Keywords:quotient hypergroups, signed hypergroups, Laguerre convolution, Jacobi functions
Categories:43A62, 33C25, 43A20, 43A90
2. CJM 1998 (vol 50 pp. 897)
|Fourier multipliers for local hardy spaces on ChÃ©bli-TrimÃ¨che hypergroups |
In this paper we consider Fourier multipliers on local Hardy spaces $\qin$ $(0