Conjecture on scaling limits selecting viscosity solutions of Euler equations

Let QNi,νiQ_{N_i,\nu_i} be probability laws associated with sequences νi0\nu_i\to 0 and NiN_i\to\infty, and suppose that {QNi,νi}i\{Q_{N_i,\nu_i}\}_i is weakly convergent to a probability measure QQ. Let H\mathcal{H} denote the set of viscosity solutions of the Euler equations starting at the initial datum ξ0\xi_0. Scaling-limit conjecture. The limit QQ is a probability measure supported on H\mathcal{H}.

Earlier compactness arguments show that subsequential limits are probability distributions on weak solutions of the deterministic Euler equations, but uniqueness is not known. The conjecture asserts that allowing the dimension parameter NiN_i to vary together with the vanishing viscosity parameter νi\nu_i selects viscosity solutions, a stronger conclusion than the general superposition-solution result.

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Primary source

Franco Flandoli, Lucio Galeati and Dejun Luo, “Scaling limit of stochastic 2D Euler equations with transport noises to the deterministic Navier-Stokes equations”, arXiv:1905.12352 (2019).

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