AI 中文总结
研究\(\mathbb{R}^d_x\times\mathbb{R}^d_v\)上弗拉索夫 - 泊松系统局部适定性,在初始分布各向异性假设下,利用加权速度上确界等条件,通过绍德尔不动点构造解,由洛珀型稳定性估计证唯一性,给出密度和电场相关结论。
AI 中文摘要
我们在关于初始分布的各向异性假设下,证明了\(\mathbb{R}^d_x\times\mathbb{R}^d_v\)(\(d\geq2\))上弗拉索夫 - 泊松系统的局部适定性准则。数据具有有限质量,其加权速度上确界属于\(L^p_x\)(\(p>d\)),并且在速度变量上具有任意小的正赫尔德正则性,关于速度一致且具有相同的空间\(L^p\)控制。主要估计是一个非线性混合界\([\rho(t)]_{C^\alpha_x}\lesssim t^{-d/p - \epsilon}C(f_0)\)(\(\epsilon>0\) 很小)。因此密度在时间上可积且取值于正的空间赫尔德类,相应电场属于\(L^1_tC^{1,\alpha}_x\)。我们通过对密度的绍德尔不动点构造解,并通过洛珀型稳定性估计证明唯一性。
英文摘要
We prove a local well-posedness criterion for the Vlasov--Poisson system on $\R^d_x\times\R^d_v$, $d\geq2$, under an anisotropic assumption on the initial distribution. The datum has finite mass, its weighted velocity supremum belongs to $L^p_x$ for some $p>d$, and it has an arbitrarily small positive Hölder regularity in the velocity variable, uniformly with respect to velocity and with the same spatial $L^p$ control. The main estimate is a nonlinear mixing bound \[ [ρ(t)]_{C^α_x}\lesssim t^{-d/p-ε}C(f_0), \qquad ε>0~~\text{small}. \] Thus the density is integrable in time with values in a positive spatial Hölder class, and the corresponding electric field belongs to $L^1_tC^{1,α}_x$. We construct a solution by a Schauder fixed point on the density and prove uniqueness by a Loeper-type stability estimate.
Comments21 pages