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arXiv 0906.5580math.RT
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离散Wallach点的分支律

Branching laws for discrete Wallach points

Stéphane Merigon, Henrik Seppänen

摘要:

本文考虑对称管域$V\oplus iΩ$的全纯自同构群的投影表示,它们是由全纯离散级数的解析延拓得到的。对于一个表示对应于一个离散点的Wallach集,我们发现分解下的单位连通区分量的$GL(Ω)$的限制。利用Riesz分布,构造了一个显式的缠绕算子作为一个积分算子的解析延拓。Plancherel测度的密度涉及到$Γ$ -函数和小秩对称锥的$c$ -函数的乘积。

英文摘要:

We consider the (projective) representations of the group of holomorphic automorphisms of a symmetric tube domain $V\oplus iΩ$ that are obtained by analytic continuation of the holomorphic discrete series. For a representation corresponding to a discrete point in the Wallach set, we find the decomposition under restriction to the identity component of $GL(Ω)$. Using Riesz distributions, an explicit intertwining operator is constructed as an analytic continuation of an integral operator. The density for the Plancherel measure involves quotients of $Γ$-functions and the $c$-function for a symmetric cone of smaller rank.

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