#### Vol. 13, No. 1, 2020

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A well-posedness result for viscous compressible fluids with only bounded density

### Raphaël Danchin, Francesco Fanelli and Marius Paicu

Vol. 13 (2020), No. 1, 275–316
##### Abstract

We are concerned with the existence and uniqueness of solutions with only bounded density for the barotropic compressible Navier–Stokes equations. Assuming that the initial velocity has slightly subcritical regularity and that the initial density is a small perturbation (in the ${L}^{\infty }$ norm) of a positive constant, we prove the existence of local-in-time solutions. In the case where the density takes two constant values across a smooth interface (or, more generally, has striated regularity with respect to some nondegenerate family of vector fields), we get uniqueness. This latter result supplements the work by D. Hoff (Comm. Pure Appl. Math. 55:11 (2002), 1365–1407) with a uniqueness statement, and is valid in any dimension $d\ge 2$ and for general pressure laws.

##### Keywords
compressible Navier–Stokes equations, bounded density, maximal regularity, tangential regularity, Lagrangian formulation
##### Mathematical Subject Classification 2010
Primary: 35Q35
Secondary: 35B65, 76N10, 35B30, 35A02