# On certain anisotropic elliptic equations arising in congested optimal transport: local gradient bounds

created by brasco on 31 Jul 2012
modified on 20 Jun 2013

[BibTeX]

Accepted Paper

Inserted: 31 jul 2012
Last Updated: 20 jun 2013

Motivated by applications to congested optimal transport problems, we prove higher integrability results for the gradient of solutions to some anisotropic elliptic equations, exhibiting a wide range of degeneracy. The model case we have in mind is the following: $\partial_x \left[( u_{x} -\delta_1)_+^{q-1}\, \frac{u_{x}}{\vert u_{x}\vert}\right]+\partial_y \left[( u_{y} -\delta_2)_+^{q-1}\, \frac{u_{y}}{\vert u_{y}\vert}\right]=f,$ for $2\le q<\infty$ and some non negative parameters $\delta_1,\delta_2$. Here $(\,\cdot\,)_+$ stands for the positive part. We prove that if $f\in L^\infty_{loc}$, then $\nabla u\in L^r_{loc}$ for every $r\ge 1$.