# PDE Seminar Spring 2023

### Fridays, 3:30 — 4:20pm, Stevenson Center 1210 (in-person) or via Zoom (online). When possible, in-person talks will be live streamed.

Date: **Friday, February 3rd, 2023.**

- Speaker:
**Sanchit Chaturvedi, Stanford University.** - Title: Vanishing viscosity and shock formation in Burgers equation
- Abstract: I will talk about the shock formation problem for 1D Burgers equation in the presence of small viscosity. Although the vanishing viscosity problem till moments before the first shock and in presence of a fully developed shocks is very classical, little is known about the moment of shock formation. We develop a matched asymptotic expansion to describe the solution to the viscous Burgers equation (with small viscosity) to arbitrary order up to the first singularity time. The main feature of the work is the inner expansion that accommodates the viscous effects close to the shock location and match it to the usual outer expansion (in viscosity). We do not use the Cole-Hopf transform and hence we believe that this approach works for more general scalar 1D conservation laws. Time permitting, I will talk about generalizing to vanishing viscosity limit from compressible Navier–Stokes to compressible Euler equations. This is joint work with Cole Graham (Brown university).

Date: **Friday, February 10th, 2023.**

- Speaker:
**Ryan Unger, Princeton University.** - Title: TBA
- Abstract: TBA

Date: **Friday, February 17th, 2023.**

- Speaker:
**Ronghua Pan, Georgia Institute of Technology.** - Title: TBA
- Abstract: TBA

Date: **Friday, March 3rd, 2023.**

- Speaker:
**Allen Fang, Princeton University.** - Title: TBA
- Abstract: TBA

Date: **Friday, April 7th, 2023.**

- Speaker:
**Lili He, Johns Hopkins University** - Title: TBA
- Abstract: TBA

Date: **Friday, April 14th, 2023.**

- Speaker:
**Steve Shkoller, University of California Davis** - Title: TBA
- Abstract: TBA

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