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An invariance principle and a large deviation principle for the biased random walk on ${\mathbb{Z}}^{\lowercase{\textbf{\textit{d}}}}$

Published online by Cambridge University Press:  04 May 2020

Yuelin Liu*
Affiliation:
Nankai University
Vladas Sidoravicius*
Affiliation:
CIMS; NYU-Shanghai
Longmin Wang*
Affiliation:
Nankai University
Kainan Xiang*
Affiliation:
Xiangtan University
*
*Postal address: School of Mathematical Sciences, LPMC, Nankai University, Tianjin, 300071, China.
***Postal address: Courant Institute of Mathematical Sciences, New York, NY10012, USA; NYU-ECNU Institute of Mathematical Sciences, NYU-Shanghai, Shanghai, 200122, China.
*Postal address: School of Mathematical Sciences, LPMC, Nankai University, Tianjin, 300071, China.
****Postal address: School of Mathematics and Computational Science, Xiangtan University, Xiangtan City, 411105, China.

Abstract

We establish an invariance principle and a large deviation principle for a biased random walk ${\text{RW}}_\lambda$ with $\lambda\in [0,1)$ on $\mathbb{Z}^d$ . The scaling limit in the invariance principle is not a d-dimensional Brownian motion. For the large deviation principle, its rate function is different from that of a drifted random walk, as may be expected, though the reflected biased random walk evolves like the drifted random walk in the interior of the first quadrant and almost surely visits coordinate planes finitely many times.

Type
Research Papers
Copyright
© Applied Probability Trust 2020

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