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On the Schwartz correspondence for Gelfand pairs of polynomial growth
Rendiconti Lincei-Matematica e Applicazioni ( IF 0.6 ) Pub Date : 2021-04-22 , DOI: 10.4171/rlm/927
Francesca Astengo 1 , Bianca Di Blasio 2 , Fulvio Ricci 3
Affiliation  

Let $(G,K)$ be a Gelfand pair, with $G$ a Lie group of polynomial growth, and let $\Sigma\subset\mathbb R^\ell$ be a homeomorphic image of the Gelfand spectrum, obtained by choosing a generating system $D_1,\dots,D_\ell$ of $G$-invariant differential operators on $G/K$ and associating to a bounded spherical function $\phi$ the $\ell$-tuple of its eigenvalues under the action of the $D_j$'s.

We say that property (S) holds for $(G,K)$ if the spherical transform maps the bi-$K$-invariant Schwartz space $\mathcal S(K\backslash G/K)$ isomorphically onto $\mathcal S(\Sigma)$, the space of restrictions to $\Sigma$ of the Schwartz functions on $\mathbb R^\ell$. This property is known to hold for many nilpotent pairs, i.e., Gelfand pairs where $G=K\ltimes N$, with $N$ nilpotent.

In this paper we enlarge the scope of this analysis outside the range of nilpotent pairs, stating the basic setting for general pairs of polynomial growth and then focussing on strong Gelfand pairs.



中文翻译:

关于Gelfand对多项式增长的Schwartz对应

设$(G,K)$为Gelfand对,$ G $为多项式增长的Lie群,设$ \ Sigma \ subset \ mathbb R ^ \ ell $为Gelfand谱的同胚图像,通过选择生成系统$ G / K $上$ G $不变微分算子的生成系统$ D_1,\ dots,D_ \ ell $并与有界球面函数$ \ phi $其特征值下的$ \ ell $元组相关联$ D_j $的动作。

我们说如果球面变换将双$ K $不变Schwartz空间$ \ mathcal S(K \反斜杠G / K)$同构映射到$ \ mathcal S上,则属性(S)对于$(G,K)$成立。 (\ Sigma)$,Schwartz函数在$ \ mathbb R ^ \ ell $上对$ \ Sigma $的限制空间。已知此属性可用于许多幂对,即Gelfand对,其中$ G = K \ l乘以N $,而$ N $为幂。

在本文中,我们将分析的范围扩大到幂等对的范围之外,阐述了多项式增长的一般对的基本设置,然后重点介绍了强Gelfand对。

更新日期:2021-04-23
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