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arXiv 2508.06384math.AP
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扩散测度与非线性抛物方程

Diffuse measures and nonlinear parabolic equations

Francesco Petitta, Augusto C. Ponce, Alessio Porretta

AI总结:

本文针对带扩散测度的非线性抛物方程,证明了水平集的p-抛物容量先验估计,引入基于强逼近性质的重正规化解概念,并证明含吸收项方程解的存在性与唯一性,推广至一般散度形式算子。

摘要:

给定一个抛物柱体 $Q =(0,T)\timesΩ$,其中 $Ω\subset \mathbb{R}^{N}$ 是有界域,我们证明了具有 Dirichlet 边界条件的方程 \\[ u_t-Δ_p u = μ\quad \text{in $Q$} \\] 的解的新性质,其中 $μ$ 是 $Q$ 中的有限 Radon 测度。我们首先证明了 $u$ 的水平集的 $p$-抛物容量的先验估计。然后我们证明扩散测度(即不赋予零抛物 $p$-容量集合正测度的测度)可以被测度 $μ_k = (T_k(u))_t-Δ_p(T_k(u))$ 强逼近,并基于此性质引入了重正规化解的新概念。最后,我们应用我们的新方法来证明方程 $$ u_t-Δ_{p} u + h(u)=μ\quad \text{in $Q$,} $$ 的解的存在性,其中 $h$ 满足 $h(s)s\geq 0$ 且 $μ$ 是任意扩散测度;当 $h$ 非递减时,我们还证明了重正规化表述中的唯一性。结果可推广到更一般的散度形式非线性算子的情形。

英文摘要:

Given a parabolic cylinder $Q =(0,T)\timesΩ$, where $Ω\subset \mathbb{R}^{N}$ is a bounded domain, we prove new properties of solutions of \[ u_t-Δ_p u = μ\quad \text{in $Q$} \] with Dirichlet boundary conditions, where $μ$ is a finite Radon measure in $Q$. We first prove a priori estimates on the $p$-parabolic capacity of level sets of $u$. We then show that diffuse measures (i.e.\@ measures which do not charge sets of zero parabolic $p$-capacity) can be strongly approximated by the measures $μ_k = (T_k(u))_t-Δ_p(T_k(u))$, and we introduce a new notion of renormalized solution based on this property. We finally apply our new approach to prove the existence of solutions of $$ u_t-Δ_{p} u + h(u)=μ\quad \text{in $Q$,} $$ for any function $h$ such that $h(s)s\geq 0$ and for any diffuse measure $μ$; when $h$ is nondecreasing we also prove uniqueness in the renormalized formulation. Extensions are given to the case of more general nonlinear operators in divergence form.

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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