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Random walks in attractive potentials: the case of critical drifts. (English) Zbl 06938565
Summary: We consider random walks in attractive potentials – sub-additive functions of their local times. An application of a drift to such random walks leads to a phase transition: If the drift is small than the walk is still sub-ballistic, whereas the walk is ballistic if the drift is strong enough. The set of sub-critical drifts is convex with non-empty interior and can be described in terms of Lyapunov exponents [M. P. W. Zerner, Ann. Appl. Probab. 8, No. 1, 246–280 (1998; Zbl 0938.60098)]. Recently it was shown that super-critical drifts lead to a limiting speed. We shall explain that in dimensions $$d \geq 2$$ the transition is always of the first order.
##### MSC:
 60Kxx Special processes 82Bxx Equilibrium statistical mechanics 82Bxx Equilibrium statistical mechanics
Zbl 0938.60098
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##### References:
 [1] Dmitry Ioffe and Yvan Velenik. Ballistic phase of self-interacting random walks. In $$Analysis and stochastics of growth processes and interface models$$, pages 55-79. Oxford Univ. Press, Oxford, 2008. | · Zbl 1255.60168 [2] Martin P. W. Zerner. Directional decay of the Green’s function for a random nonnegative potential on $$\mathbf{Z}^d$$. $$Ann. Appl. Probab.$$, 8(1):246-280, 1998. | | Copyright Cellule MathDoc 2018 · Zbl 0938.60098
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