Open Research Index

The Critical 2D KPZ Process

Scott Armstrong

Palomar Registrypalomar/PALOMAR-2026-10-28-000014Oct 28, 2026math.PRscore 0

A Lean 4 formalization of "The Critical 2D KPZ Process" by Berger, Caravenna, Clark, Dunlap, Gu, Liu, Nakajima, Sun, Tsai, Xie and Zygouras (arXiv:2610.31614, version 1), together with selected inputs and adaptations in the form these proofs need. For directed polymers on Z^2 in a Gaussian environment at critical disorder, it proves the existence of a critical 2D stochastic heat flow, defined as the joint limit in law of the rescaled partition functions (Theorem A). The centred log-partition function converges in law, in the local negative Sobolev spaces H^{-a}_loc and jointly in finitely…

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