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arXiv math/0607299math.FAmath.OA
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Feichtinger Segal代数上的算子空间结构

Operator space structure on Feichtinger's Segal algebra

Nico Spronk

摘要:

本文将Feichtinger的著名Segal代数S_0(G)的定义从阿贝尔群群类推广到一般的局部紧群G.为了得到非交换群的函子性质,特别是张量积公式,我们赋予S_0(G)一个算子空间结构.具有这种结构的S_0(G)同时是傅立叶代数A(G)和群代数L^1(G)的算子Segal代数。我们证明了这种算子空间结构与主要函子性质是一致的:(i)S_0(G)\hat{\otimes} S_0(H)=S_0(G \times H)完全同构(算子投射张量积),如果H是另一个局部紧群;(ii)限制映射u \mapsto u| H:S_0(G)\to S_0(H)是完全满射的,如果H是闭子群;(iii)T_N:S_0(G)\to S_0(G/N)是完全满射的,其中N是正规子群且T_N u(sN)= \int_N u(sn)dn.当G同时被看作点态代数和卷积代数时,我们还证明了S_0(G)是G的不变量。

英文摘要:

We extend the definition, from the class of abelian groups to a general locally compact group G, of Feichtinger's remarkable Segal algebra S_0(G). In order to obtain functorial properties for non-abelain groups, in particular a tensor product formula, we endow S_0(G) with an operator space structure. With this structure S_0(G) is simultaneously an operator Segal algebra of the Fourier algebra A(G), and of the group algebra L^1(G). We show that this operator space structure is consistent with the major functorial properties: (i) S_0(G)\hat{\otimes}S_0(H)=S_0(G\times H) completely isomorphically (operator projective tensor product), if H is another locally compact group; (ii) the restriction map u\mapsto u|_H:S_0(G)\to S_0(H) is completely surjective, if H is a closed subgroup; and (iii) T_N:S_0(G)\to S_0(G/N) is completely surjective, where N is a normal subgroup and T_N u(sN)=\int_N u(sn)dn. We also show that S_0(G) is an invariant for G when it is treated simultaneously as a pointwise algebra and a convolutive algebra.

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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