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广义Gelfand-Tsetlin图及其q-边界和q-B-样条

Extended Gelfand-Tsetlin graph, its q-boundary, and q-B-splines

Grigori Olshanski

摘要:

继续瓦迪姆·戈林和作者J·丰科特的联合工作。Anal. 270(2016),375-418; arXiv:1504.06832.在该论文中引入的扩展Gelfand-Tsetlin图是一种新的组合对象。它的q-边界是由一个双边q-格上的无穷多个点的组态构成的。q-边界携带一个连续的概率测度族,它们是所谓的zw-测度的q-模拟,zw-测度起源于无限维酉群上的调和分析问题。本文证明了某些与扩展Gelfand-Tsetlin图及其q-边界相联系的转移马尔可夫核具有Feller性质。这个属性是需要建立一个模型的马尔可夫动力学的q边界。讨论了B样条与经典B样条及其q-类似样条的关系。论文arXiv:1504.06832中的一些结果用另一种方法重新推导。

英文摘要:

A continuation of the joint work by Vadim Gorin and the author, J. Funct. Anal. 270 (2016), 375-418; arXiv:1504.06832. The extended Gelfand-Tsetlin graph, introduced in that paper, is a novel combinatorial object. Its q-boundary is formed by infinite point configurations on a two-sided q-lattice. The q-boundary carries a continuous family of probability measures that are a q-analogue of the so-called zw-measures, which originated in the problem of harmonic analysis on the infinite-dimensional unitary group. In the present paper, it is proved that certain transition Markov kernels, linked to the extended Gelfand-Tsetlin graph and its q-boundary, possess the Feller property. This property is needed for constructing a model of Markov dynamics on the q-boundary. A connection with the classical B-splines and their q-analogues is discussed. Some results of the paper arXiv:1504.06832 are rederived in another way.

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