Ping He, Jiangang Ying
In this paper, we shall prove that the irreducibility in the sense of fine topology implies the uniqueness of invariant probability measures. It is also proven that this irreducibility is strictly weaker than the strong Feller property plus irreducibility in the sense of original topology, which is the usual uniqueness condition.
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Strong Feller property, irreducibility, and uniqueness of the invariant measure for stochastic PDEs with degenerate multiplicative noise
本文研究了退化乘性噪声下随机PDEs的强Feller性质和不可约性，并证明了在无强耗散假设下不变测度的唯一性，通过测量解向势垒的积累，赋予退化噪声系数的逆意义。
Irreducibility of Quantum Markov Semigroups, uniqueness of invariant states and related properties
本文研究了量子马尔可夫半群的不可约性及其与不变态唯一性等性质的关系，提出了检查不可约性的方法并推导了新结果。
In this short article, we shall study one-dimensional local Dirichlet spaces. One result, which has its independent interest, is to prove that irreducibility implies the uniqueness of symmetrizing measure for right Markov processes. The other result is to give a representation for any 1-dim local, irreducible and regular Dirichlet space and a necessary and sufficient condition for a Dirichlet space to be regular subspace of another Dirichlet space.
Let $X$ be an irreducible symmetric Markov process with the strong Feller property. We assume, in addition, that $X$ is explosive and has a tightness property. We then prove the existence and uniqueness of quasi-stationary distributions of $X$.
The existence of stationary distributions to distribution dependent stochastic differential equations are investigated by using the ergodicity of the associated decoupled equation and the Schauder fixed point theorem. By using Zvonkin's transformation, we also establish the existence result for equations with singular coefficients. Instead of the uniqueness, the non-uniqueness of stationary distributions are considered for equations with regular coefficients. Concrete examples including McKean-Vlasov stochastic equations with the quadratic interaction and the non-quadratic interaction, and equ…
Existence and uniqueness of quasi-stationary and quasi-ergodic measures for absorbing Markov chains: a Banach lattice approach
该研究在弱条件与自然正则性假设下，借助Banach格方法，证明了几乎必然吸收的离散时间马尔可夫链的拟平稳测度和拟遍历测度的存在性与唯一性。
We investigate the existence of invariant measures for self-stabilizing diffusions. These stochastic processes represent roughly the behavior of some Brownian particle moving in a double-well landscape and attracted by its own law. This specific self-interaction leads to nonlinear stochastic differential equations and permits to point out singular phenomenons like non uniqueness of associated stationary measures. The existence of several invariant measures is essentially based on the non convex environment and requires generalized Laplace's method approximations.
Stationary distributions of McKean-Vlasov SDEs with jumps: existence, uniqueness, and multiplicity
本文研究带跳McKean-Vlasov随机微分方程平稳分布的存在性、唯一性与多重性，利用Schauder不动点定理和Lyapunov条件等方法，并通过示例展示方程可具有一至三个平稳分布。
On the uniqueness of quasi-stationary distributions for population models with spatial structure
本文研究了具有空间结构的人口模型中准稳分布的唯一性，通过引入谱系和分支随机游走，证明了其在添加少量额外信息后具有唯一性。
We present a proof of the almost sure existence, uniqueness and coalescence of directed semi-infinite geodesics in planar growth models that is based on properties of an increment-stationary version of the growth process. The argument is developed in the context of the exponential corner growth model. It uses coupling, planar monotonicity, and properties of the stationary growth process to derive the existence of Busemann functions, which in turn control geodesics. This soft approach is in some situations an alternative to the much-applied 20-year-old arguments of C. Newman and co-authors. Alo…
We study the long time behaviour of a Markov process evolving in $\mathbb{N}$ and conditioned not to hit 0. Assuming that the process comes back quickly from infinity, we prove that the process admits a unique quasi-stationary distribution (in particular, the distribution of the conditioned process admits a limit when time goes to infinity). Moreover, we prove that the distribution of the process converges exponentially fast in total variation norm to its quasi-stationary distribution and we provide an explicit rate of convergence. As a first application of our result, we bring a new insight o…
On the Existence and Uniqueness of Stationary Distributions for Some Piecewise Deterministic Markov Processes With State-Dependent Jump Intensity
本文研究一类分段确定性马尔可夫过程，证明其平稳分布与跳跃后位置马尔可夫链的平稳分布一一对应，并据此为随机迭代函数系统情形建立平稳分布存在唯一性判据。
We study the ergodic theory of stationary directed nearest-neighbor polymer models on $\mathbb Z^2$, with i.i.d. weights. Such models are equivalent to specifying a stationary distribution on the space of weights and correctors that satisfy certain consistency conditions. We show that for prescribed weight distribution and corrector mean, there is at most one stationary polymer distribution which is ergodic under the $e_1$ or $e_2$ shift. Further, if the weights have more than two moments and the corrector mean vector is an extreme point of the superdifferential of the limiting free energy, th…
We consider a Markov process $ X(t) $ on the nonnegative integers $E= S \cup \{0\}$, where $S=\{1,2,...\}$ is an irreducible class and 0 is an absorbing state. In this paper, we investigate conditions under which the quasi-stationary distribution for $X(t)$ exists and is unique, and any initial distribution supported in $S$ is in the domain of attraction of this quasi-stationary distribution. We further find five conditions which are equivalent to that the extinction time is uniformly bounded. As a consequence, we prove the van Doorn's conjecture in \cite{VD2012}. And we can greatly improve th…
In this short paper, we consider a quadruple $(Ω, Å, θ, μ)$,where $Å$ is a $σ$-algebra of subsets of $Ω$, and $θ$ is a measurable bijection from $Ω$ into itself that preserves the measure $μ$. For each $B \in Å$, we consider the measure $μ_B$ obtained by taking cycles (excursions) of iterates of $θ$ from $B$. We then derive a relation for $μ_B$ that involves the forward and backward hitting times of $B$ by the trajectory $(θ^n ω, n \in \Z)$ at a point $ω\in Ω$. Although classical in appearance, its use in obtaining uniqueness of invariant measures of various stochastic models seems to be new. …
We continue the study of Markov systems started in \cite{Wer1}. In this paper, we prove a generalization of Breiman's strong low of large numbers \cite{Br} which implies a necessary condition for the uniqueness of the stationary state of a Markov system.
A stochastic differential equation with infinite memory is considered. The drift coefficient of the equation is a nonlinear functional of the past history of the solution. Sufficient conditions for existence and uniqueness of stationary solution are given.
Quasi-stationary distribution for continuous-state branching processes with competition
本文研究带竞争的连续状态分支过程的拟平稳分布，建立该过程的多项正则性与不可约性，证明竞争项足够强时存在唯一以指数速率吸引所有初始分布的拟平稳分布。
Doubling variables and uniqueness of probability solutions to degenerate stationary Kolmogorov equations
针对具有退化扩散矩阵的平稳Kolmogorov方程，通过直接应用随机分析中的变量加倍方法，得到其概率解唯一性的充分条件。
An elementary proof of existence and uniqueness of stationary distributions for irreducible Markov chains
该研究针对满足行和为1、元素非负且不可约的n×n矩阵P，利用基础代数和Bolzano-Weierstrass定理，给出了其严格正且和为1的平稳行向量存在唯一性这一经典结果的初等证明。
We consider an inviscid stochastically forced dyadic model, where the additive noise acts only on the first component. We prove that a strong solution for this problem exists and is unique by means of uniform energy estimates. Moreover, we exploit these results to establish strong existence and uniqueness of the stationary distribution.
The present paper studies existence and distributional uniqueness of subclasses of stationary hard-core particle systems arising as thinnings of stationary particle processes. These subclasses are defined by natural maximality criteria. We investigate two specific criteria, one related to the intensity of the hard-core particle process, the other one being a local optimality criterion on the level of realizations. In fact, the criteria are equivalent under suitable moment conditions. We show that stationary hard-core thinnings satisfying such criteria exist and are frequently distributionally …
This paper introduces stochastic processes that describe the evolution of systems of particles in which particles immigrate according to a Poisson measure and split according to a self-similar fragmentation. Criteria for existence and absence of stationary distributions are established and uniqueness is proved. Also, convergence rates to the stationary distribution are given. Linear equations which are the deterministic counterparts of fragmentation with immigration processes are next considered. As in the stochastic case, existence and uniqueness of solutions, as well as existence and uniquen…
For the multivariate COGARCH(1,1) volatility process we show sufficient conditions for the existence of a unique stationary distribution, for the geometric ergodicity and for the finiteness of moments of the stationary distribution by a Foster-Lyapunov drift condition approach. The test functions used are naturally related to the geometry of the cone of positive semi-definite matrices and the drift condition is shown to be satisfied if the drift term of the defining stochastic differential equation is sufficiently `negative'. We show easily applicable sufficient conditions for the needed irred…
Non-uniqueness of stationary measures for stochastic systems with almost surely invariant manifolds
本文提出一般框架，利用不变子流形的横向Lyapunov不稳定性构造额外平稳测度，证明Lorenz 96模型在阻尼参数足够小时平稳测度发生分岔，产生恰好两个不同的平稳测度。
Consider the Langevin process, described by a vector (position,momentum) in $\mathbb{R}^{d}\times\mathbb{R}^d$. Let $\mathcal O$ be a $\mathcal{C}^2$ open bounded and connected set of $\mathbb{R}^d$. We prove the compactness of the semigroup of the Langevin process absorbed at the boundary of the domain $D:=\mathcal{O}\times\mathbb{R}^d$. We then obtain the existence of a unique quasi-stationary distribution (QSD) for the Langevin process on $D$. We also provide a spectral interpretation of this QSD and obtain an exponential convergence of the Langevin process conditioned on non-absorption tow…
Uniqueness of stationary compatible probability measures for chains of infinite order with forbidden transitions
本文研究了在可数状态空间上具有禁止转移的无限阶链的 stationary 兼容概率测度的唯一性问题，提出了一组充分条件以保证最多存在一个 stationary 概率测度与核兼容，并扩展了 Johansson 和 Öberg (2003) 提出的 $\ell^2$ 唯一性准则，应用于强非空链，并通过具体例子展示了主要定理及其推论，并与现有文献结果进行了比较。
Convergence to non-minimal quasi-stationary distributions for one-dimensional diffusions is studied. We give a method of reducing the convergence to the tail behavior of the lifetime via a property which we call the first hitting uniqueness. We apply the results to Kummer diffusions with negative drifts and give a class of initial distributions converging to each non-minimal quasi-stationary distribution.
In this paper we study a class of Quasi-Skipfree (QSF) processes where the transition rate submatrices in the skipfree direction have a column times row structure. Under homogeneity and irreducibility assumptions we show that the stationary distributions of these processes have a product form as a function of the level. For an application, we will discuss the ${\it Cox(k)}/M^Y/1$-queue, that can be modelled as a QSF process on a two-dimensional state space. In addition we study the properties of the stationary distribution and derive monotonicity of the mean number of the customers in the queu…
Stationary switching random walks
本文研究切换随机游走，识别其不变测度及唯一性，证明拓扑常返与不可约性，并联系更新论平稳分布与 Lebesgue 测度平稳性。
Multi-level reflecting Brownian motion on the half line and its stationary distribution
本文研究半直线上具有有限多个状态处漂移和方差不连续变化的多级反射布朗运动，证明其弱解唯一存在，并在正常返条件下推导出具有简单解析表达式的平稳分布。
Quasi-stationary distributions for time-changed symmetric $α$-stable processes killed upon hitting zero
该研究针对从无穷远进入、击中零点即被吸收的时间变换对称$\alpha$-稳定过程，证明了其拟平稳分布的存在唯一性，并在转移密度相关条件下证明任意初始分布指数收敛到该分布。
We show that Zhang's sandpile model (N,[a,b]) on N sites and with uniform additions on [a,b] has a unique stationary measure for all 0 <= a < b <= 1. This generalizes earlier results where this was shown in some special cases. We define the infinite volume Zhang's sandpile model in dimension d >= 1, in which topplings occur according to a Markov toppling process, and we study the stabilizability of initial configurations chosen according to some measure μ. We show that for a stationary ergodic measure μwith density ρ, for all ρ< 1/2, μis stabilizable; for all ρ>= 1, μis not stabilizable; for 1…
In this paper, we prove a general result concerning finite-range, attractive interacting particle systems on $\{-1, 1\}^{\mathbb{Z}^d}$. If the particle system has a unique stationary measure and, in a precise sense, relaxes to this stationary measure at an exponential rate then any small perturbation of the dynamics also has a unique stationary measure to which it relaxes at an exponential rate. To augment this result, we study the particular case of Glauber dynamics for the Ising model. We show that for any non-zero external field the dynamics converges to its unique invariant measure at an …
The random Weierstrass zeta function I. Existence, uniqueness, fluctuations
本文提出一种在给定平稳点过程处具有单位留数简单极点的随机亚纯函数构造方法，刻画了使其减去均值后平稳的有限二阶矩条件，并将其视为 Weierstrass zeta 函数的随机类比或随机点电荷电场。
Computing the stationary distributions of a continuous-time Markov chain (CTMC) involves solving a set of linear equations. In most cases of interest, the number of equations is infinite or too large, and the equations cannot be solved analytically or numerically. Several approximation schemes overcome this issue by truncating the state space to a manageable size. In this review, we first give a comprehensive theoretical account of the stationary distributions and their relation to the long-term behaviour of CTMCs that is readily accessible to non-experts and free of irreducibility assumptions…
Let Λbe a finite subset of Z^d. We study the following sandpile model on Λ. The height at any given vertex x of Λis a positive real number, and additions are uniformly distributed on some interval [a,b], which is a subset of [0,1]. The threshold value is 1; when the height at a given vertex exceeds 1, it topples, that is, its height is reduced by 1, and the heights of all its neighbours in Λincrease by 1/2d. We first establish that the uniform measure μon the so called "allowed configurations" is invariant under the dynamics. When a < b, we show with coupling ideas that starting from any initi…
Stationary distribution of the stochastic theta method for nonlinear stochastic differential equations
研究随机θ方法生成数值解的平稳分布存在性和唯一性，分析不同θ值对漂移和扩散系数的要求，探讨数值平稳分布收敛性并给出数值实验验证。
Well-posedness and stationary distribution of free stochastic differential equations
本文在非交换概率框架下，利用自由伊藤积分，在局部算子Lipschitz和Lyapunov型条件下证明自由布朗运动驱动的自由随机微分方程的整体适定性，并在耗散条件下建立平稳解的存在唯一性。
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