The Annals of Probability

Central limit theorem for random walks in doubly stochastic random environment: ${\mathscr{H}_{-1}}$ suffices

Gady Kozma and Bálint Tóth

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Abstract

We prove a central limit theorem under diffusive scaling for the displacement of a random walk on $\mathbb{Z}^{d}$ in stationary and ergodic doubly stochastic random environment, under the ${\mathscr{H}_{-1}}$-condition imposed on the drift field. The condition is equivalent to assuming that the stream tensor of the drift field be stationary and square integrable. This improves the best existing result [Fluctuations in Markov Processes—Time Symmetry and Martingale Approximation (2012) Springer], where it is assumed that the stream tensor is in $\mathscr{L}^{\max\{2+\delta,d\}}$, with $\delta>0$. Our proof relies on an extension of the relaxed sector condition of [Bull. Inst. Math. Acad. Sin. (N.S.) 7 (2012) 463–476], and is technically rather simpler than existing earlier proofs of similar results by Oelschläger [Ann. Probab. 16 (1988) 1084–1126] and Komorowski, Landim and Olla [Fluctuations in Markov Processes—Time Symmetry and Martingale Approximation (2012) Springer].

Article information

Source
Ann. Probab. Volume 45, Number 6B (2017), 4307-4347.

Dates
Received: November 2014
Revised: October 2016
First available in Project Euclid: 12 December 2017

Permanent link to this document
https://projecteuclid.org/euclid.aop/1513069261

Digital Object Identifier
doi:10.1214/16-AOP1166

Subjects
Primary: 60F05: Central limit and other weak theorems 60G99: None of the above, but in this section 60K37: Processes in random environments

Keywords
Random walk in random environment central limit theorem Kipnis–Varadhan theory sector condition

Citation

Kozma, Gady; Tóth, Bálint. Central limit theorem for random walks in doubly stochastic random environment: ${\mathscr{H}_{-1}}$ suffices. Ann. Probab. 45 (2017), no. 6B, 4307--4347. doi:10.1214/16-AOP1166. https://projecteuclid.org/euclid.aop/1513069261


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