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• W3208270168 abstract "In this paper, we deal with the $2frac{1}{2}$ dimensional Hall MHD by taking the velocity field $u$ and the magnetic field $B$ of the form $u(t,x,y)=left(nabla^{perp}phi(t,x,y), W(t,x,y)right)$ and $B(t,x,y)=left(nabla^{perp}psi(t,x,y), Z(t,x,y)right)$. We begin with the Hall equations (without the effect of the fluid part). We first show the long time behavior of weak solutions and weak-strong uniqueness. We then proceed to prove the existence of unique strong solutions locally in time and to derive a blow-up criterion. We also demonstrate that the strong solution exists globally in time and decay algebraically if some smallness conditions are imposed. We further improve the decay rates of $psi$ using the structure of the equation of $psi$. As a consequence of the decay rates of $(psi,Z)$, we find the asymptotic profiles of $(psi,Z)$. We finally show that a small perturbation of initial data near zero can be extended to a small perturbations near harmonic functions. In the presence of the fluid filed, the results, by comparison, fall short of the previous ones in the absence of the fluid part. We prove two results: the existence of unique strong solutions locally in time and a blow-up criterion, and the existence of unique strong solutions globally in time with some smallness condition on initial data." @default.
• W3208270168 created "2021-11-08" @default.
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• W3208270168 date "2021-11-01" @default.
• W3208270168 modified "2023-09-24" @default.
• W3208270168 title "On the existence and temporal asymptotics of solutions for the two and half dimensional Hall MHD" @default.
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• W3208270168 doi "https://doi.org/10.48550/arxiv.2111.01344" @default.
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