Crossing probability for directed polymers in random media. II. Exact tail of the distribution

We study the probability p ≡ p(η)(t) that two directed polymers in a given random potential η and with fixed and nearby endpoints do not cross until time t. This probability is itself a random variable (over samples η), which, as we show, acquires a very broad probability distribution at large time....

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Bibliographic Details
Published in:Physical review. E 2016-03, Vol.93 (3), p.032118-032118, Article 032118
Main Authors: De Luca, Andrea, Le Doussal, Pierre
Format: Article
Language:English
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Summary:We study the probability p ≡ p(η)(t) that two directed polymers in a given random potential η and with fixed and nearby endpoints do not cross until time t. This probability is itself a random variable (over samples η), which, as we show, acquires a very broad probability distribution at large time. In particular, the moments of p are found to be dominated by atypical samples where p is of order unity. Building on a formula established by us in a previous work using nested Bethe ansatz and Macdonald process methods, we obtain analytically the leading large time behavior of all moments p(m) ≃ γ(m)/t. From this, we extract the exact tail ∼ρ(p)/t of the probability distribution of the noncrossing probability at large time. The exact formula is compared to numerical simulations, with excellent agreement.
ISSN:2470-0045
2470-0053
DOI:10.1103/PhysRevE.93.032118