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The Intermediate Disorder Regime for Directed Polymers in Dimension 1+1 · Around

2010

The Intermediate Disorder Regime for Directed Polymers in Dimension 1+1

Alberts, Tom, Khanin, Kostya, Quastel, Jeremy

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We introduce a new disorder regime for directed polymers with one space and one time dimension that is accessed by scaling the inverse temperature parameter \beta with the length of the polymer n.

We scale \beta_n := \beta n^{-\alpha} for alpha non-negative.
This scaling sits in between the usual weak disorder (\beta = 0) and strong disorder regimes (\beta > 0).
The fluctuation exponents zeta for the polymer endpoint and \chi for the free energy depend on \alpha in this regime, with \alpha = 0 corresponding to the usual polymer exponents \zeta = 2/3, \chi = 1/3 and \alpha >= 1/4 corresponding to the simple random walk exponents \zeta = 1/2, \chi = 0.

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