Weak solutions for the Stokes system for compressible non-Newtonian fluids with unbounded divergence

We investigate the existence of weak solutions to a certain system of partial differential equations, modeling the behavior of a compressible non-Newtonian fluid for small Reynolds number. We construct the weak solutions despite the lack of the L infinity estimate on the divergence of the velocity field. The result was obtained by combining the regularity theory for singular operators with a certain logarithmic integral inequality for BMO BMO functions, which allowed us to adjust the method from Feireisl et al. (2015) to more relaxed conditions on the velocity.