English

Weak convergence of random walks conditioned to stay away

Probability 2010-09-06 v1

Abstract

Let {Xn}nN\{X_n\}_{n\in\mathbb{N}} be a sequence of i.i.d. random variables in Zd\mathbb{Z}^d. Let Sk=X1+...+XkS_k=X_1+...+X_k and Yn(t)Y_n(t) be the continuous process on [0,1][0,1] for which Yn(k/n)=Sk/nY_n(k/n)=S_k/\sqrt{n} k=1,...,nk=1,...,n and which is linearly interpolated elsewhere. The paper gives a generalization of results of Belkin, \cite{B72} on the weak limit laws of Yn(t)Y_n(t) conditioned to stay away from some small sets. In particular, it is shown that the diffusive limit of the random walk meander on Zd:d2\mathbb Z^d: d\ge 2 is the Brownian motion.

Keywords

Cite

@article{arxiv.1009.0700,
  title  = {Weak convergence of random walks conditioned to stay away},
  author = {Zsolt Pajor-Gyulai and Domokos Szász},
  journal= {arXiv preprint arXiv:1009.0700},
  year   = {2010}
}

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6 pages