论文标题

噪声增强的莱维过程:莱维 - itô分解和应用

Noise Reinforced Lévy Processes: Lévy-Itô Decomposition and Applications

论文作者

Rosales-Ortiz, Alejandro

论文摘要

步骤加强随机步行是一个离散的时间过程,具有内存,因此,在(0,1)$中固定概率$ p \ in(0,1)$中,它重复一个先前执行的步骤,随机随机选择,而互补的概率$ 1-p $,它可以使用固定法律执行独立的步骤。 In the continuum, the main result of Bertoin in [7] states that the random walk constructed from the discrete-time skeleton of a Lévy process for a time partition of mesh-size $1/n$ converges, as $n \uparrow \infty$ in the sense of finite dimensional distributions, to a process $\hatξ$ referred to as a noise reinforced Lévy process.我们的第一个主要结果指出,噪声增强的Lévy流程具有RCLL路径,并满足$ \ textit {噪声加强} $lévyItô的分解,就其跳跃的$ \ textit {噪声加强} $ poisson Point流程而言。我们介绍了Lévy流程的联合分布及其加强版本$(ξ,\ hat配给)$,并表明,这对与Lévy流程的骨架及其步骤加强版本相符,因为网格尺寸趋向于$ 0 $ 0 $。作为应用程序,我们分析了原点上$ \ hatT表的增长率,并将其主要特征确定为无限划分的过程。

A step reinforced random walk is a discrete time process with memory such that at each time step, with fixed probability $p \in (0,1)$, it repeats a previously performed step chosen uniformly at random while with complementary probability $1-p$, it performs an independent step with fixed law. In the continuum, the main result of Bertoin in [7] states that the random walk constructed from the discrete-time skeleton of a Lévy process for a time partition of mesh-size $1/n$ converges, as $n \uparrow \infty$ in the sense of finite dimensional distributions, to a process $\hatξ$ referred to as a noise reinforced Lévy process. Our first main result states that a noise reinforced Lévy processes has rcll paths and satisfies a $\textit{noise reinforced}$ Lévy Itô decomposition in terms of the $\textit{noise reinforced}$ Poisson point process of its jumps. We introduce the joint distribution of a Lévy process and its reinforced version $(ξ, \hatξ)$ and show that the pair, conformed by the skeleton of the Lévy process and its step reinforced version, converge towards $(ξ, \hatξ)$ as the mesh size tend to $0$. As an application, we analyse the rate of growth of $\hatξ$ at the origin and identify its main features as an infinitely divisible process.

扫码加入交流群

加入微信交流群

微信交流群二维码

扫码加入学术交流群,获取更多资源