一类流动介质下超过程占位时的状态特征

本文考虑流动介质下的粒子系统，在Ｄａｗｓｏｎ假设下引出一类带广义分枝的测度值分枝过程（超过程）．这类超过程描述了更丰富的粒子分枝现象，具有许多独特的性质．在此我们主要研究其积分过程即占位时过程，揭示了它的两个重要特性即密度场的存在性和长时间的收敛性．     

一类S＇（R^1）值OU过程的自交局部时

Gauss型S’(R^d)值OU过程可由超过程在一定条件下取波动极限得到．本文讨论了一类新的S’(R^1)值OU过程的自交局部时的存在性，连续性证明了这些性质与粒子的分枝强度和交互作用参变量的依赖关系．还讨论了当自交局部时不存在时，经过重整化的近似自交局部时满足一定的收敛性质．     

一类S′(R1)值OU过程的自交局部时

Gauss型S′(R~d)值OU过程可由超过程在一定条件下取波动极限得到。本文讨论了一类新的S′(R~1)值OU过程的自交局部时的存在性,连续性。证明了这些性质与粒子的分枝强度和交互作用参变量的依赖关系。还讨论了当自交局部时不存在时,经过重整化的近似自交局部时满足一定的收敛性质。     

一类广泛超稳定过程占位时的渐近行为

本文在「１」的基础上，针对非常值分枝率对应的一类广泛超α－稳定过程占位时过程，证明了在非临界情况下其渐近行为与「１」中相同，但在临界时其渐近性依赖于分枝率在无穷远点的极限行为，从而得到了更为精细的结果。     

一类自相似马氏过程的局部时

获得了一类自相似马氏过程的局部时存在性和联合连续的充分条件。     

两参数Ornstein－Uhlenbeck过程的自相交局部时与k重时的维数

本文研究两参数ｄ维Ｏｒｎｓｔｅｉｎ－Ｕｈｌｅｎｂｅｃｋ过程的相交局部时的联合连续性，ｋ重点的存在性．当４ｋ＞（ｋ－１）ｄ时，得到了ＯＵＰ２．ｄ的ｋ重时集的Ｈａｕｓｄｏｒｆｆ维数与ｐａｃｋｉｎｇ维数．     

广义α-stable过程自相交局部时增量的Holder律及重点

文研究了 N 指标 d 维广义α-stable过程自相交局部时增量的Holder律. 并利用所得自相交局部时的性质, 证明了该过程重点的存在性, 得到了该过程多重时的Hausdorff维数及测度的下界.所得结论包含并推广了广义布朗单及stable单相应的结果.     

双分式Brown运动的自相交局部时和相遇局部时

考虑一个双分式Brown运动的局部时、自相交局部时和两个独立的双分式Brown运动的相遇局部时问题．通过双分式Brown运动的强局部不确定性、L^2收敛和混沌展开,验证自相交局部时和相遇局部时的存在性和光滑性．     

广义α-stable过程自相交局部时增量的Hlder律及重点

该文研究了N指标d维广义α-stable过程自相交局部时增量的Holder律．并利用所得自相交局部时的性质,证明了该过程重点的存在性,得到了该过程多重时的Hausdorff维数及测度的下界．所得结论包含并推广了广义布朗单及stable单相应的结果．     

两个相互独立的多分数布朗运动的碰撞局部时

本文利用白噪声分析方法研究了两个相互独立的多分数布朗运动的碰撞局部时问题.首先分别讨论了碰撞局部时在Hida广义泛函空间和L~2空间中的存在性.进一步,利用多分数布朗运动的局部不确定性获得了该局部时的正则性条件.     

Clark Representation for Local Times of Self-Intersection of Gaussian Integrators

Ukrainian Mathematical Journal - We prove the existence of multiple local times of self-intersection for a class of Gaussian integrators generated by operators with finite-dimensional kernels,,...     

Intersection Local Times of Independent Fractional Brownian Motions as Generalized White Noise Functionals

In this work we present expansions of intersection local times of fractional Brownian motions in ? ^d , for any dimension d??1, with arbitrary Hurst coefficients in (0,1) ^d . The expansions are in terms of Wick powers of white noises (corresponding to multiple Wiener integrals), being well-defined in the sense of generalized white noise functionals. As an application of our approach, a sufficient condition on d for the existence of intersection local times in L ² is derived, extending the results in Nualart and Ortiz-Latorre (J. Theoret. Probab. 20(4):759?C767, 2007) to different and more general Hurst coefficients.     

Regularity of Intersection Local Times of Fractional Brownian Motions

Let \(B^{\alpha_{i}}\) be an (N _i ,d)-fractional Brownian motion with Hurst index α _i (i=1,2), and let \(B^{\alpha_{1}}\) and \(B^{\alpha_{2}}\) be independent. We prove that, if \(\frac{N_{1}}{\alpha_{1}}+\frac{N_{2}}{\alpha_{2}}>d\), then the intersection local times of \(B^{\alpha_{1}}\) and \(B^{\alpha_{2}}\) exist, and have a continuous version. We also establish Hölder conditions for the intersection local times and determine the Hausdorff and packing dimensions of the sets of intersection times and intersection points.One of the main motivations of this paper is from the results of Nualart and Ortiz-Latorre (J. Theor. Probab. 20:759–767, 2007), where the existence of the intersection local times of two independent (1,d)-fractional Brownian motions with the same Hurst index was studied by using a different method. Our results show that anisotropy brings subtle differences into the analytic properties of the intersection local times as well as rich geometric structures into the sets of intersection times and intersection points.     

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Let, be two independent,
-dimensional sub-fractional Brownian motions with respective indices.
Assume. Our principal results are the necessary and sufficient condition for the
existence and smoothness of the collision local time and the intersection local time of
and through chaos expansion and elementary inequalities.     

Almost Sure Comparisons for First Passage Times of Diffusion Processes through Boundaries

Conditions on the boundary and parameters that produce ordering in the first passage time distributions of two different diffusion processes are proved making use of comparison theorems for stochastic differential equations. Three applications of interest in stochastic modeling are presented: a sensitivity analysis for diffusion models characterized by means of first passage times, the comparison of different diffusion models where first passage times represent an important feature and the determination of upper and lower bounds for first passage time distributions.     

On Moduli of Continuity for Local Times of Fractional Stable Processes

We establish estimates for moduli of continuity of the local times of a class of self-similar stable processes. Our arguments yield also sharp lower bounds for the Hausdorff measure of the level sets of these processes. Finally, we prove the continuity in law of the local times with respect to the self-similarity index for a wide class of self-similar stable processes.     

DIMENSION RESULTS FOR ORNSTEIN-UHLENBECK TYPE MARKOV PROCESS

Let {X_t, t ≥ 0} be an Ornstein-Uhlenbeck type Markov process with Levy process A_t, the authors consider the fractal properties of its ranges, give the upper and lower bounds of the Hausdorff dimensions of the ranges and the estimate of the dimensions of the level sets for the process. The existence of local times and occuption times of X_t are considered in some special situations.     

齐次Poisson过程中到达时刻的分布

利用多项分布、区间分解等方法研究了齐次Poi8son过程中粒子到达时刻的分布规律,对许多定理进行研究和推广,得到了更为一般的结果.     

Local Times of Subdiffusive Biased Walks on Trees

Consider a class of null-recurrent randomly biased walks on a supercritical Galton–Watson tree. We obtain the scaling limits of the local times and the quenched local probability for the biased walk in the subdiffusive case. These results are a consequence of a sharp estimate on the return time, whose analysis is driven by a family of concave recursive equations on trees.     

Differential Games of Mixed Type with Control and Stopping Times

We study a zero sum differential game of mixed type where each player uses both control and stopping times. Under certain conditions we show that the value function for this problem exists and is the unique viscosity solution of the corresponding variational inequalities. We also show the existence of saddle point equilibrium for a special case of differential game.