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Coupling Derivation of Optimal-Order Central Moment Bounds in Exponential Last-Passage Percolation
Elnur Emrah1, Nicos Georgiou2, Janosch Ortmann3
1School of Mathematics, University of Bristol, Bristol, UK.
Abstract:
We introduce new probabilistic arguments to derive optimal-order central moment bounds in planar directed last-passage percolation. Our technique is based on couplings with the increment-stationary variants of the model, and is presented in the context of i.i.d. exponential weights for both zero and near-stationary boundary conditions. A main technical novelty in our approach is a new proof of the left-tail fluctuation upper bound with exponent 3/2 for the last-passage times.
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