Superdiffusivity for a Brownian polymer in a continuous Gaussian environment

Details Superdiffusivity for a Brownian polymer in a continuous Gaussian environment Superdiffusivity for a Brownian polymer in a continuous Gaussian environment

2008-10-24

arxiv.org/abs/0810.4378v1

Annals of Probability 2008, Vol. 36, No. 5, 1642-1675

Mathematics

Probability

Published in at http://dx.doi.org/10.1214/07-AOP363 the Annals of Probability (http://www.imstat.org/aop/) by the Institute of

Scientific paper

10.1214/07-AOP363

This paper provides information about the asymptotic behavior of a one-dimensional Brownian polymer in random medium represented by a Gaussian field $W$ on ${\mathbb{R}}_+\times{\mathbb{R}}$ which is white noise in time and function-valued in space. According to the behavior of the spatial covariance of $W$, we give a lower bound on the power growth (wandering exponent) of the polymer when the time parameter goes to infinity: the polymer is proved to be superdiffusive, with a wandering exponent exceeding any $\alpha<3/5$.

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