Bernoulli
- Bernoulli
- Volume 23, Number 2 (2017), 1233-1278.
Asymptotics of random processes with immigration I: Scaling limits
Alexander Iksanov, Alexander Marynych, and Matthias Meiners
Abstract
Let $(X_{1},\xi_{1}),(X_{2},\xi_{2}),\ldots$ be i.i.d. copies of a pair $(X,\xi)$ where $X$ is a random process with paths in the Skorokhod space $D[0,\infty)$ and $\xi$ is a positive random variable. Define $S_{k}:=\xi_{1}+\cdots+\xi_{k}$, $k\in\mathbb{N}_{0}$ and $Y(t):=\sum_{k\geq0}X_{k+1}(t-S_{k})\mathbf{1}_{\{S_{k}\leq t\}}$, $t\geq0$. We call the process $(Y(t))_{t\geq0}$ random process with immigration at the epochs of a renewal process. We investigate weak convergence of the finite-dimensional distributions of $(Y(ut))_{u>0}$ as $t\to\infty$. Under the assumptions that the covariance function of $X$ is regularly varying in $(0,\infty)\times(0,\infty)$ in a uniform way, the class of limiting processes is rather rich and includes Gaussian processes with explicitly given covariance functions, fractionally integrated stable Lévy motions and their sums when the law of $\xi$ belongs to the domain of attraction of a stable law with finite mean, and conditionally Gaussian processes with explicitly given (conditional) covariance functions, fractionally integrated inverse stable subordinators and their sums when the law of $\xi$ belongs to the domain of attraction of a stable law with infinite mean.
Article information
Source
Bernoulli, Volume 23, Number 2 (2017), 1233-1278.
Dates
Received: June 2015
First available in Project Euclid: 4 February 2017
Permanent link to this document
https://projecteuclid.org/euclid.bj/1486177398
Digital Object Identifier
doi:10.3150/15-BEJ776
Mathematical Reviews number (MathSciNet)
MR3606765
Zentralblatt MATH identifier
06701625
Keywords
random process with immigration renewal theory shot noise processes weak convergence of finite-dimensional distributions
Citation
Iksanov, Alexander; Marynych, Alexander; Meiners, Matthias. Asymptotics of random processes with immigration I: Scaling limits. Bernoulli 23 (2017), no. 2, 1233--1278. doi:10.3150/15-BEJ776. https://projecteuclid.org/euclid.bj/1486177398