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arXiv 1801.09433math.PR
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马氏过程的自对偶性与交织函数

Self-duality of Markov processes and intertwining functions

Chiara Franceschini, Cristian Giardinà, Wolter Groenevelt

摘要:

本文给出了一个定理,阐明了马尔可夫过程的自对偶性与李代数的表示论之间的联系。特别地,我们确定了充分条件,使得一个特定的李代数的两个表示之间的交织函数是一个(马尔可夫)算子的自对偶函数。具体地说,这两种表征与两种操作符相关联,处于交织关系。自对偶算子是一个马尔可夫过程的生成元,它是由它们的适当对称线性组合产生的。该定理被应用到一系列的例子,包括马尔可夫过程的离散状态空间(例如相互作用的粒子系统)和马尔可夫过程的连续状态空间(例如扩散过程)。在例子中,我们使用的李代数的显式表示是酉等价的。因此,在离散设置的自对偶函数是由正交多项式,而在连续的上下文中,他们是贝塞尔函数。

英文摘要:

We present a theorem which elucidates the connection between self-duality of Markov processes and representation theory of Lie algebras. In particular, we identify sufficient conditions such that the intertwining function between two representations of a certain Lie algebra is the self-duality function of a (Markov) operator. In concrete terms, the two representations are associated to two operators in interwining relation. The self-dual operator, which arise from an appropriate symmetric linear combination of them, is the generator of a Markov process. The theorem is applied to a series of examples, including Markov processes with a discrete state space (e.g. interacting particle systems) and Markov processes with continuous state space (e.g. diffusion processes). In the examples we use explicit representations of Lie algebras that are unitary equivalent. As a consequence, in the discrete setting self-duality functions are given by orthogonal polynomials whereas in the continuous context they are Bessel functions.

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