Global well-posedness and refined regularity criterion for the uni-directional Euler-alignment system

2023/08/18 by Yatao Li, Li, Yatao, Qianyun Miao +5 · 1 citation
Mathematics · #35B40 #35B65 #35Q35 #76N10 #Analysis of PDEs (math.AP) #FOS: Mathematics #Navier-Stokes equation solutions

paper · pdf · doi:10.48550/arxiv.2308.09609

openalex publication_date 2023/08/18 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01

Abstract

We investigate global solutions to the Euler-alignment system in d dimensions with unidirectional flows and strongly singular communication protocols ϕ(x) = |x|^-(d+α) for α∈ (0,2). Our paper establishes global regularity results in both the subcritical regime 1<α<2 and the critical regime α=1. Notably, when α=1, the system exhibits a critical scaling similar to the critical quasi-geostrophic equation. To achieve global well-posedness, we employ a novel method based on propagating the modulus of continuity. Our approach introduces the concept of simultaneously propagating multiple moduli of continuity, which allows us to effectively handle the system of two equations with critical scaling. Additionally, we improve the regularity criteria for solutions to this system in the supercritical regime 0<α<1.

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