Laguerre半群与Dunkl算子
Laguerre semigroup and Dunkl operators
摘要：
利用R^N \setminus {0}上的微分-差分算子构造了李代数sl（2，R）的双参数作用族ω_{k，a}.这里k是Dunkl算子的重函数，a>0是由Mp（N，R）的Weil表示和O（N+1，2）的极小酉表示的插值得到的，且保持较小的对称性.我们证明了作用ω k，a提升到SL（2，R）的泛覆盖的一个酉表示，甚至可以推广到全纯半群Ω k，a.在k \equiv 0情形下，我们的半群推广了R. Howe（a=2）和Laguerre半群，G. Mano（a=1）。半群Ω_{k，a}的一个边值为我们提供了（k，a）-广义傅里叶变换F_{k,a}，它包括Dunkl变换D_k（a=2）和一个新的酉算子H_k（a=1），即Dunkl-Hankel变换.我们建立了反演公式，推广了Plancherel定理，Hecke恒等式，Bochner恒等式，以及F_{k,a}的Heisenberg测不准不等式。利用Bessel函数和Dunkl交织算子，我们还找到了Ω_{k，a}和F_{k,a}（a= 1，2）的核函数.
英文摘要：
We construct a two-parameter family of actions ω_{k,a} of the Lie algebra sl(2,R) by differential-difference operators on R^N \setminus {0}. Here, k is a multiplicity-function for the Dunkl operators, and a>0 arises from the interpolation of the Weil representation of Mp(N,R) and the minimal unitary representation of O(N+1,2) keeping smaller symmetries. We prove that this action ω_{k,a} lifts to a unitary representation of the universal covering of SL(2,R), and can even be extended to a holomorphic semigroup Ω_{k,a}. In the k\equiv 0 case, our semigroup generalizes the Hermite semigroup studied by R. Howe (a=2) and the Laguerre semigroup by the second author with G. Mano (a=1). One boundary value of our semigroup Ω_{k,a} provides us with (k,a)-generalized Fourier transforms F_{k,a}, which includes the Dunkl transform D_k (a=2) and a new unitary operator H_k (a=1), namely a Dunkl-Hankel transform. We establish the inversion formula, and a generalization of the Plancherel theorem, the Hecke identity, the Bochner identity, and a Heisenberg uncertainty inequality for F_{k,a}. We also find kernel functions for Ω_{k,a} and F_{k,a} for a=1,2 in terms of Bessel functions and the Dunkl intertwining operator.
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