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arXiv 2104.02795math.APmath.CA
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一类奇异或退化椭圆型方程的Besov正则性

Besov regularity for a class of singular or degenerate elliptic equations

Pasquale Ambrosio

摘要:

受拥挤的交通问题的应用程序的启发,我们建立了更高的可积性结果的梯度的局部弱解的强退化或奇异椭圆型PDE $-\mathrm{div}\left((\vert\nabla u\vert-1)_{+}^{q-1}\frac{\nabla u}{\vert\nabla u\vert}\right)=f$,$\mathrm{in}\,\,Ω$,其中$Ω$是一个有界域$\mathbb{R}^{n}$的$n\geq2$,$1<q<\infty$和$\left(\,\cdot\,\right)_{+}$代表的积极的一部分。我们假设数据$f$属于一个合适的Sobolev或Besov空间。这里的主要新颖之处是,我们处理的情况下,次二次增长,即$1<q<2$,这是迄今为止一直被忽视。在后一种情况下,我们还证明了一个变分问题的解的更高的分数阶可微性,这是由上述方程的特征。为了完整性,我们最后给出了$q\geq2$情形下的Besov正则性结果.

英文摘要:

Motivated by applications to congested traffic problems, we establish higher integrability results for the gradient of local weak solutions to the strongly degenerate or singular elliptic PDE $-\mathrm{div}\left((\vert\nabla u\vert-1)_{+}^{q-1}\frac{\nabla u}{\vert\nabla u\vert}\right)=f$, $\mathrm{in}\,\,Ω$, where $Ω$ is a bounded domain in $\mathbb{R}^{n}$ for $n\geq2$, $1<q<\infty$ and $\left(\,\cdot\,\right)_{+}$ stands for the positive part. We assume that the datum $f$ belongs to a suitable Sobolev or Besov space. The main novelty here is that we deal with the case of subquadratic growth, i.e. $1<q<2$, which has so far been neglected. In the latter case, we also prove the higher fractional differentiability of the solution to a variational problem, which is characterized by the above equation. For the sake of completeness, we finally give a Besov regularity result also in the case $q\geq2$.

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