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arXiv 1109.5533math.RTmath.FA
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一种模拟元代数表示

A mock metaplectic representation

Filippo De Mari, Ernesto De Vito

摘要:

得到了一个新的酉不可约表示$U$的容许向量的充要条件。群$G$是一个任意的半直积,它的正规因子$A$是阿贝尔的,它的齐次因子$H$是作用在黎曼流形$M$上的局部紧的第二可数群。构建$U$的关键成分是$H$对对偶基团$\hat A$和对$M$的作用之间的$C^1$交织映射。表示$U$将元代数表示的限制推广到$Sp(d,\R)$的三角子群,因此称为“模拟元代数”。为了简单起见,我们满足于$A=\R^n$和$M=\R^d$。其技术要点是将$U$分解为不可约分量的直接积分。这一理论是由信号分析的一些最新发展,特别是剪切波。许多相关的例子进行了讨论。

英文摘要:

We obtain necessary and sufficient conditions for the admissible vectors of a new unitary non irreducible representation $U$. The group $G$ is an arbitrary semidirect product whose normal factor $A$ is abelian and whose homogeneous factor $H$ is a locally compact second countable group acting on a Riemannian manifold $M$. The key ingredient in the construction of $U$ is a $C^1$ intertwining map between the actions of $H$ on the dual group $\hat A$ and on $M$. The representation $U$ generalizes the restriction of the metaplectic representation to triangular subgroups of $Sp(d,\R)$, whence the name "mock metaplectic". For simplicity, we content ourselves with the case where $A=\R^n$ and $M=\R^d$. The main technical point is the decomposition of $U$ as direct integral of its irreducible components. This theory is motivated by some recent developments in signal analysis, notably shearlets. Many related examples are discussed.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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