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Infinite dimensional Ornstein-Uhlenbeck processes driven by Lévy processes 无限维度的Ornstein-Uhlenbeck过程由lsamvy过程驱动
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-11-11 DOI: 10.1214/14-PS249
D. Applebaum
We review the probabilistic properties of Ornstein-Uhlenbeck processes in Hilbert spaces driven by Levy processes. The emphasis is on the different contexts in which these processes arise, such as stochastic partial differential equations, continuous-state branching processes, generalised Mehler semigroups and operator self-decomposable distributions. We also examine generalisations to the case where the driving noise is cylindrical.
研究了由Levy过程驱动的Hilbert空间中Ornstein-Uhlenbeck过程的概率性质。重点是这些过程产生的不同背景,如随机偏微分方程、连续状态分支过程、广义Mehler半群和算子自分解分布。我们还研究了驱动噪声为圆柱形的情况的概括。
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引用次数: 24
Conformal restriction and Brownian motion 共形限制和布朗运动
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-09-05 DOI: 10.1214/15-PS259
Hao Wu
This survey paper is based on the lecture notes for the mini course in the summer school at Yau Mathematics Science Center, Tsinghua University, 2014. We describe and characterize all random subsets (K) of simply connected domain which satisfy the "conformal restriction" property. There are two different types of random sets: the chordal case and the radial case. In the chordal case, the random set (K) in the upper half-plane (mathbb{H}) connects two fixed boundary points, say 0 and (infty), and given that (K) stays in a simply connected open subset (H) of (mathbb{H}), the conditional law of (Phi(K)) is identical to that of (K), where (Phi) is any conformal map from (H) onto (mathbb{H}) fixing 0 and (infty ). In the radial case, the random set (K) in the upper half-plane (mathbb{H}) connects one fixed boundary points, say 0, and one fixed interior point, say (i), and given that (K) stays in a simply connected open subset (H) of (mathbb{H}), the conditional law of (Phi(K)) is identical to that of (K), where (Phi) is the conformal map from (H) onto (mathbb{H}) fixing 0 and (i). It turns out that the random set with conformal restriction property are closely related to the intersection exponents of Brownian motion. The construction of these random sets relies on Schramm Loewner Evolution with parameter (kappa=8/3) and Poisson point processes of Brownian excursions and Brownian loops.
本调查论文基于2014年清华大学丘数学科学中心暑期学校迷你课程的课堂讲稿。我们描述并刻画了单连通域上满足“共形限制”性质的所有随机子集(K)。有两种不同类型的随机集:弦状情况和径向情况。在弦的情况下,上半平面(mathbb{H})上的随机集(K)连接两个固定的边界点,例如0和(infty),并且给定(K)在(mathbb{H})的单连通开子集(H)中,(Phi(K))的条件律与(K)的条件律相同,其中(Phi)是从(H)到(mathbb{H})的任何保角映射,固定0和(infty)。在径向情况下,上半平面(mathbb{H})上的随机集(K)连接了一个固定的边界点(假设0)和一个固定的内部点(假设i),并且给定(K)位于(mathbb{H})的单连通开放子集(H)中,(Phi(K))的条件律与(K)的条件律相同,其中(Phi)是由(H)到(mathbb{H})的共形映射,固定0和(i)。结果表明,具有共形约束性质的随机集合与布朗运动的交指数密切相关。这些随机集的构造依赖于参数(kappa=8/3)的Schramm Loewner演化和布朗漂移和布朗环的泊松点过程。
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引用次数: 5
Fractional Gaussian fields: A survey 分数阶高斯场:综述
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-07-21 DOI: 10.1214/14-PS243
A. Lodhia, S. Sheffield, Xin Sun, Samuel S. Watson
We discuss a family of random fields indexed by a parameter s ∈ R which we call the fractional Gaussian fields, given by FGFs(R) = (−∆)−s/2W, where W is a white noise on Rd and (−∆)−s/2 is the fractional Laplacian. These fields can also be parameterized by their Hurst parameter H = s − d/2. In one dimension, examples of FGFs processes include Brownian motion (s = 1) and fractional Brownian motion (1/2 < s < 3/2). Examples in arbitrary dimension include white noise (s = 0), the Gaussian free field (s = 1), the bi-Laplacian Gaussian field (s = 2), the log-correlated Gaussian field (s = d/2), Levy’s Brownian motion (s = d/2 + 1/2), and multidimensional fractional Brownian motion (d/2 < s < d/2 + 1). These fields have applications to statistical physics, early-universe cosmology, finance, quantum field theory, image processing, and other disciplines. We present an overview of fractional Gaussian fields including covariance formulas, Gibbs properties, spherical coordinate decompositions, restrictions to linear subspaces, local set theorems, and other basic results. We also define a discrete fractional Gaussian field and explain how the FGFs with s ∈ (0, 1) can be understood as a long range Gaussian free field in which the potential theory of Brownian motion is replaced by that of an isotropic 2s-stable Levy process. ∗Partially supported by NSF grant DMS 1209044. †Supported by NSF GRFP award number 1122374. ar X iv :1 40 7. 55 98 v1 [ m at h. PR ] 2 1 Ju l 2 01 4
我们讨论了一类以参数s∈R为索引的随机场,我们称之为分数阶高斯场,由fgf (R) =(-∆)- s/2W给出,其中W是Rd上的白噪声,(-∆)- s/2是分数阶拉普拉斯函数。这些字段也可以通过它们的Hurst参数H = s−d/2来参数化。在一维中,FGFs过程的例子包括布朗运动(s = 1)和分数布朗运动(1/2 < s < 3/2)。任意维度的例子包括白噪声(s = 0)、高斯自由场(s = 1)、双拉普拉斯高斯场(s = 2)、对数相关高斯场(s = d/2)、利维布朗运动(s = d/2 + 1/2)和多维分数布朗运动(d/2 < s < d/2 + 1)。这些领域在统计物理、早期宇宙宇宙学、金融、量子场论、图像处理等学科中都有应用。我们概述了分数阶高斯场,包括协方差公式、吉布斯性质、球坐标分解、线性子空间的限制、局部集定理和其他基本结果。我们还定义了一个离散分数高斯场,并解释了如何将s∈(0,1)的fgf理解为一个远程高斯自由场,其中布朗运动的势理论被各向同性2s稳定Levy过程的势理论所取代。*部分由NSF资助DMS 1209044。†由NSF GRFP奖号1122374支持。ar X iv:1 40 7。55 98 v1 [m at h. PR] 2 1 Ju 1 2 01 4
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引用次数: 86
Characterizations of GIG laws: A survey GIG法律的特征:一项调查
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-07-17 DOI: 10.1214/13-PS227
A. Koudou, Christophe Ley
Several characterizations of the Generalized Inverse Gaussian (GIG) distribution on the positive real line have been proposed in the literature, especially over the past two decades. These characterization theorems are surveyed, and two new characterizations are established, one based on maximum likelihood estimation and the other is a Stein characterization.
广义逆高斯分布在正实线上的几个特征已经在文献中提出,特别是在过去的二十年中。对这些表征定理进行了综述,建立了两种新的表征定理,一种是基于极大似然估计,另一种是Stein表征。
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引用次数: 31
Hyperbolic measures on infinite dimensional spaces 无限维空间上的双曲测度
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-05-12 DOI: 10.1214/14-PS238
S. Bobkov, J. Melbourne
Localization and dilation procedures are discussed for infinite dimensional �-concave measures on abstract locally convex spaces (following Borell’s hierarchy of hyperbolic measures).
讨论了抽象局部凸空间上无限维凹测度的局部化和扩张过程(遵循Borell的双曲测度层次)。
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引用次数: 15
On moment sequences and mixed Poisson distributions 矩序列与混合泊松分布
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-03-11 DOI: 10.1214/14-PS244
Markus Kuba, A. Panholzer
In this article we survey properties of mixed Poisson distributions and probabilistic aspects of the Stirling transform: given a non-negative random variable (X) with moment sequence ((mu_s)_{sinmathbb{N}}) we determine a discrete random variable (Y), whose moment sequence is given by the Stirling transform of the sequence ((mu_s)_{sinmathbb{N}}), and identify the distribution as a mixed Poisson distribution. We discuss properties of this family of distributions and present a new simple limit theorem based on expansions of factorial moments instead of power moments. Moreover, we present several examples of mixed Poisson distributions in the analysis of random discrete structures, unifying and extending earlier results. We also add several entirely new results: we analyse triangular urn models, where the initial configuration or the dimension of the urn is not fixed, but may depend on the discrete time (n). We discuss the branching structure of plane recursive trees and its relation to table sizes in the Chinese restaurant process. Furthermore, we discuss root isolation procedures in Cayley trees, a parameter in parking functions, zero contacts in lattice paths consisting of bridges, and a parameter related to cyclic points and trees in graphs of random mappings, all leading to mixed Poisson-Rayleigh distributions. Finally, we indicate how mixed Poisson distributions naturally arise in the critical composition scheme of Analytic Combinatorics.
本文研究了混合泊松分布的性质和斯特林变换的概率方面:给定一个矩序列为((mu_s)_{sinmathbb{N}}的非负随机变量(X),我们确定了一个离散随机变量(Y),它的矩序列由序列((mu_s)_{sinmathbb{N}})的斯特林变换给出,并确定该分布为混合泊松分布。我们讨论了这类分布的性质,并提出了一个新的简单极限定理,该定理是基于阶乘矩的展开式而不是幂矩。此外,我们给出了几个混合泊松分布在随机离散结构分析中的例子,统一和推广了先前的结果。我们还增加了几个全新的结果:我们分析了三角形瓮模型,其中瓮的初始配置或尺寸不是固定的,但可能取决于离散时间(n)。我们讨论了平面递归树的分支结构及其与中国餐馆过程中桌子大小的关系。此外,我们讨论了Cayley树的根隔离过程,停车函数中的一个参数,由桥组成的格路径中的零接触,以及随机映射图中与循环点和树相关的一个参数,所有这些都导致了混合泊松-瑞利分布。最后,我们指出混合泊松分布是如何在解析组合学的临界组合方案中自然产生的。
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引用次数: 16
Coagulation and diffusion: A probabilistic perspective on the Smoluchowski PDE 凝聚与扩散:斯摩鲁考夫斯基PDE的概率视角
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2014-01-04 DOI: 10.1214/15-PS263
A. Hammond
The Smoluchowski coagulation-diffusion PDE is a system of partial differential equations modelling the evolution in time of mass-bearing Brownian particles which are subject to short-range pairwise coagulation. This survey presents a fairly detailed exposition of the kinetic limit derivation of the Smoluchowski PDE from a microscopic model of many coagulating Brownian particles that was undertaken in [11]. It presents heuristic explanations of the form of the main theorem before discussing the proof, and presents key estimates in that proof using a novel probabilistic technique. The survey’s principal aim is an exposition of this kinetic limit derivation, but it also contains an overview of several topics which either motivate or are motivated by this derivation.
Smoluchowski混凝扩散偏微分方程(PDE)是一个模拟含质量布朗粒子在时间上的演化的偏微分方程组。这一调查提出了一个相当详细的阐述斯摩鲁乔夫斯基偏微分方程的动力学极限推导从许多凝固布朗粒子的微观模型,是在2010年进行的。在讨论证明之前,它给出了主要定理形式的启发式解释,并使用一种新的概率技术给出了该证明中的关键估计。调查的主要目的是对这个动力学极限推导的阐述,但它也包含了几个主题的概述,这些主题要么是激发的,要么是由这个推导激发的。
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引用次数: 7
On spectral methods for variance based sensitivity analysis 基于方差的灵敏度分析的光谱方法
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2013-11-22 DOI: 10.1214/13-PS219
A. Alexanderian
Consider a mathematical model with a finite number of random parameters. Variance based sensitivity analysis provides a framework to characterize the contribution of the individual parameters to the total variance of the model response. We consider the spectral methods for variance based sensitivity analysis which utilize representations of square integrable random variables in a generalized polynomial chaos basis. Taking a measure theoretic point of view, we provide a rigorous and at the same time intuitive perspective on the spectral methods for variance based sensitivity analysis. Moreover, we discuss approximation errors incurred by fixing inessential random parameters, when approximating functions with generalized polynomial chaos expansions.
考虑一个具有有限个随机参数的数学模型。基于方差的敏感性分析提供了一个框架来描述单个参数对模型响应总方差的贡献。本文研究了基于方差的灵敏度分析的谱方法,该方法利用广义多项式混沌基中平方可积随机变量的表示。从测度理论的角度出发,为方差敏感性分析的光谱方法提供了一个严谨而直观的视角。此外,我们还讨论了用广义多项式混沌展开式逼近函数时,由于固定不必要的随机参数而产生的逼近误差。
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引用次数: 17
Size bias for one and all 对所有人都有大小偏见
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2013-08-13 DOI: 10.1214/13-PS221
R. Arratia, L. Goldstein, F. Kochman
Size bias occurs famously in waiting-time paradoxes, undesirably in sampling schemes, and unexpectedly in connection with Stein's method, tightness, analysis of the lognormal distribution, Skorohod embedding, infinite divisibility, and number theory. In this paper we review the basics and survey some of these unexpected connections.
大小偏差在等待时间悖论中是出了名的,在抽样方案中是不受欢迎的,并且出乎意料地与Stein的方法、紧密性、对数正态分布分析、Skorohod嵌入、无限可除性和数论有关。在本文中,我们回顾了这些基础知识,并对其中一些意想不到的联系进行了调查。
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引用次数: 47
Gaussian multiplicative chaos and applications: A review 高斯乘法混沌及其应用综述
IF 1.6 Q2 STATISTICS & PROBABILITY Pub Date : 2013-05-27 DOI: 10.1214/13-PS218
Rémi Rhodes, V. Vargas
In this article, we review the theory of Gaussian multiplicative chaos initially introduced by Kahane’s seminal work in 1985. Though this beautiful paper faded from memory until recently, it already contains ideas and results that are nowadays under active investigation, like the construction of the Liouville measure in 2d-Liouville quantum gravity or thick points of the Gaussian Free Field. Also, we mention important extensions and generalizations of this theory that have emerged ever since and discuss a whole family of applications, ranging from nance, through the Kolmogorov-Obukhov model of turbulence to 2d-Liouville quantum gravity. This review also includes new results like the convergence of discretized Liouville measures on isoradial graphs (thus including the triangle and square lattices) towards the continuous Liouville measures (in the subcritical and critical case) or multifractal analysis of the measures in all dimensions.
在这篇文章中,我们回顾了高斯乘法混沌理论最初是由Kahane在1985年的开创性工作中提出的。虽然这篇漂亮的论文直到最近才淡出人们的记忆,但它已经包含了一些现在正在积极研究的想法和结果,比如二维刘维尔量子引力中的刘维尔测度的构建,或者高斯自由场的厚点。此外,我们还提到了这一理论的重要扩展和推广,并讨论了一系列的应用,从金融,到Kolmogorov-Obukhov湍流模型,再到2d-Liouville量子引力。本综述还包括一些新的结果,如离散化Liouville测度在等径向图(包括三角形和正方形格)上向连续Liouville测度(在亚临界和临界情况下)的收敛性,或测度在所有维度上的多重分形分析。
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引用次数: 409
期刊
Probability Surveys
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