arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2008.02823math.PR
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区间划分空间上的扩散:双参数模型

Diffusions on a space of interval partitions: The two-parameter model

Noah Forman, Douglas Rizzolo, Quan Shi, Matthias Winkel

摘要:

引入并研究了参数为$α\in(0,1)$和$θ\ge 0$的Poisson-Dirichlet $(α,θ)$平稳分布的区间分割扩散.这扩展了以前的工作的情况下$(α,0)$和$(α,α)$,并建立在我们最近的工作测量值扩散。我们的方法处理一般的$θ\ge 0$,使我们能够加强以前的工作的特殊情况下,包括初始间隔分区与灰尘。与测度值设置相反,我们可以证明这个扩展过程是一个Feller过程,它改进了在该设置中建立的Hunt属性。这些过程可以被看作是整数组成的分支图的边界上的扩散。事实上,通过研究他们的无穷小发电机在适当的准对称函数,我们将它们与扩散作为缩放限制的组合值的上下链。

英文摘要:

We introduce and study interval partition diffusions with Poisson--Dirichlet$(α,θ)$ stationary distribution for parameters $α\in(0,1)$ and $θ\ge 0$. This extends previous work on the cases $(α,0)$ and $(α,α)$ and builds on our recent work on measure-valued diffusions. Our methods for dealing with general $θ\ge 0$ allow us to strengthen previous work on the special cases to include initial interval partitions with dust. In contrast to the measure-valued setting, we can show that this extended process is a Feller process improving on the Hunt property established in that setting. These processes can be viewed as diffusions on the boundary of a branching graph of integer compositions. Indeed, by studying their infinitesimal generator on suitable quasi-symmetric functions, we relate them to diffusions obtained as scaling limits of composition-valued up-down chains.

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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