### Flatness implies smoothness for the porous medium equation

Koch, H *(University of Bonn)*

Wednesday 12 February 2014, 14:00-15:00

Seminar Room 2, Newton Institute Gatehouse

#### Abstract

We call a solution to the porous medium equation flat on a unit size space time cylinder if it is sandwiched between two close and parallel traveling wave solutions of velocity 1.
Those solutions are smooth in the sense that the pressure is a smooth function on the closure of its support, and inside a smaller space time cylinder, with nonvanishing gradient at the boundary of the support. The proof follows Caffarellis strategy of improving the flatness for rescaled solutions. An important part consists in a linearization of equation and geometry.

#### Video

**The video for this talk should appear here if JavaScript is enabled.**

If it doesn't, something may have gone wrong with our embedded player.

We'll get it fixed as soon as possible.

## Comments

Start the discussion!