Infinite geodesics, competition interfaces and the second class particle in the scaling limit

Mustazee Rahman; Balint Virag

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arXiv · 2112.06849

Infinite geodesics, competition interfaces and the second class particle in the scaling limit

Mustazee Rahman·Balint Virag

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Abstract

We establish fundamental properties of infinite geodesics and competition interfaces in the directed landscape. We construct infinite geodesics in the directed landscape, establish their uniqueness and coalescence, and define Busemann functions. We then define competition interfaces in the directed landscape. We prove the second class particle in tasep converges under KPZ scaling to a competition interface. Under suitable conditions, we show the competition interface has an asymptotic direction, analogous to the speed of a second class particle, and determine its law. Moreover, we prove the competition interface has an absolutely continuous law on compact sets with respect to infinite geodesics.

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Mustazee Rahman, Balint Virag. 2021-12-13. Infinite geodesics, competition interfaces and the second class particle in the scaling limit. https://arxiv.org/abs/2112.06849

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