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arXiv 2501.13632math.AP
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通过保持拓扑的凸积分方案得到的稳态三维欧拉流

Steady 3d Euler flows via a topology-preserving convex integration scheme

Alberto Enciso, Javier Peñafiel-Tomás, Daniel Peralta-Salas

AI总结:

通过一种保持拓扑的凸积分方案,证明了任意光滑无散向量场存在无穷多个同拓扑的稳态三维欧拉流,并推广至环面域,对等离子体研究有应用。

摘要:

给定任意光滑无散向量场 $v_0$ 在三维环面 $\mathbf T^3$ 上,我们证明了存在无穷多个具有特定弱意义下与 $v_0$ 相同拓扑的 Hölder 连续稳态欧拉流 $v$。特别地,我们证明 $v$ 具有唯一最高 Hölder 正则性的流,该流通过 $\mathbf T^3$ 的体积保持 Hölder 同胚与 $v_0$ 的流共轭。此结果推广到环面域上的欧拉方程情形,对等离子体研究有应用。证明依赖于一种新颖的凸积分方案,其关键思想是:在每一步迭代中,子解的速场必须保持与 $v_0$ 微分同胚。

英文摘要:

Given any smooth solenoidal vector field $v_0$ on $\mathbf T^3$, we show the existence of infinitely many Hölder-continuous steady Euler flows $v$ with the same topology as $v_0$, in certain weak sense. In particular, we show that $v$ possesses a unique flow of the highest Hölder regularity, which is conjugate to the flow of $v_0$ via a volume-preserving Hölder homeomorphism of $\mathbf T^3$. This result extends to the case of Euler equations on toroidal domains, which has applications to the study of plasmas. The proof relies on a novel convex integration scheme incorporating the key idea that the velocity field of the subsolutions must remain diffeomorphic to $v_0$ at each iteration step.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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