arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1105.4430math.PRmath.DG
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Sol(p,q)上的布朗运动与调和函数

Brownian motion and Harmonic functions on Sol(p,q)

Sara Brofferio, Maura Salvatori, Wolfgang Woess

摘要:

李群Sol(p,q)是由平面R^2上的实数R的作用诱导的半直积,由(x,y)-->(exp{p z} x,exp{-q z} y)给出,其中z在R中。将Sol(p,q)视为三维流形,它带有自然的黎曼度量和Laplace-Beltrami算子。我们在后者的z变量中加入一个线性漂移项,并研究了与漂移相关的布朗运动。我们导出了一个中心极限定理并计算了逃逸率。此外,我们还介绍了自然几何紧化的Sol(p,q)和解释如何布朗运动几乎必然收敛到边界的拓扑结构。我们还研究了具有漂移的拉普拉斯算子的所有正调和函数,并明确地确定了所有极小调和函数。所有这一切都是在强调理解和使用Sol(p,q)的几何特征的情况下进行的,特别是它可以被描述为两个曲率分别为-p^2和-q^2的双曲平面的horocyclic乘积。

英文摘要:

The Lie group Sol(p,q) is the semidirect product induced by the action of the real numbers R on the plane R^2 which is given by (x,y) --> (exp{p z} x, exp{-q z} y), where z is in R. Viewing Sol(p,q) as a 3-dimensional manifold, it carries a natural Riemannian metric and Laplace-Beltrami operator. We add a linear drift term in the z-variable to the latter, and study the associated Brownian motion with drift. We derive a central limit theorem and compute the rate of escape. Also, we introduce the natural geometric compactification of Sol(p,q) and explain how Brownian motion converges almost surely to the boundary in the resulting topology. We also study all positive harmonic functions for the Laplacian with drift, and determine explicitly all minimal harmonic functions. All this is carried out with a strong emphasis on understanding and using the geometric features of Sol(p,q), and in particular the fact that it can be described as the horocyclic product of two hyperbolic planes with curvatures -p^2 and -q^2, respectively.

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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