Geodesic--argmax rigidity conjecture for the directed landscape

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Let L\mathcal L be the directed landscape, let π∗(τT)\pi^*(\tau T) denote the spatial location at time τT\tau T of the relevant geodesic, and condition on L(0,0;0,T)=L\mathcal L(0,0;0,T)=L. For each τ∈(0,1)\tau\in(0,1), define the rescaled spatial argument of the directed-landscape argmax by

argmax⁡x∈RL(0,0;xT3/42L1/4,τT).\operatornamewithlimits{argmax}_{x\in\mathbb R}\mathcal L\left(0,0;\frac{xT^{3/4}}{2L^{1/4}},\tau T\right).

Geodesic--argmax rigidity conjecture. For every τ∈(0,1)\tau\in(0,1) and T>0T>0, conditionally given L(0,0;0,T)=L\mathcal L(0,0;0,T)=L, as L→∞L\to\infty,

2L1/4π∗(τT)T3/4−argmax⁡x∈RL(0,0;xT3/42L1/4,τT)→0\frac{2L^{1/4}\pi^*(\tau T)}{T^{3/4}}-\operatornamewithlimits{argmax}_{x\in\mathbb R}\mathcal L\left(0,0;\frac{xT^{3/4}}{2L^{1/4}},\tau T\right)\to 0

in probability. The conjecture asserts that the geodesic location and the argmax process become asymptotically identical under the high-height conditioning. It is motivated by the more involved definition of the geodesic and by the expected uniqueness of the conditional argmax process.

References

Primary source

Zhipeng Liu and Yizao Wang, “A conditional scaling limit of the KPZ fixed point with height tending to infinity at one location”, arXiv:2208.12215 (2022).

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