Global Well-Posedness to the n-Dimensional Compressible Oldroyd-B Model Without Damping Mechanism

We are concerned with the global well-posedness to the compressible Oldroyd-B model without a damping term in the stress tensor equation. By exploiting the intrinsic structure of the equations and introducing several new quantities for the density, the velocity and the divergence of the stress tensor, we overcome the difficulty of the lack of dissipation for the density and the stress tensor, and construct unique global solutions to this system with initial data in critical Besov spaces. As a byproduct, we obtain the optimal time decay rates of the solutions by using the pure energy argument. A similar result can be also proved for the compressible viscoelastic system without “div–curl" structure.