Stable-regime overlap conjecture for perturbed geodesics

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Let T0T_0 and TtT_t be the passage times at perturbation times 00 and tt, and let π0\pi_0 and πt\pi_t be the corresponding geodesics. Write Var⁡(T)\operatorname{Var}(T) for the variance of the passage time and let nn tend to infinity. Stable-regime overlap conjecture. If

t≪1nVar⁡(T),t \ll \frac{1}{n}\operatorname{Var}(T),

then

E[∣π0∩πt∣]=Θ(n).\mathbb{E}[|\pi_0 \cap \pi_t|]=\Theta(n).

This predicts that the geodesics retain a macroscopic expected overlap in the stable regime. The conjecture is motivated by the analogous result for Brownian last-passage percolation, while its validity in the present setting remains open.

References

Primary source

Daniel Ahlberg, Maria Deijfen and Matteo Sfragara, “From stability to chaos in last-passage percolation”, arXiv:2302.11379 (2023).

Additional references

2 papers in this index state this conjecture (2023). The statement above is taken from the most recent of them; the others are arXiv:2302.11367.

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