Global regularity for the 3D compressible magnetohydrodynamics with general pressure

We address the compressible magnetohydrodynamics (MHD) equations in R³ and establish a blow-up criterion for the local-in-time smooth solutions in terms of the density only. Namely, if the density is away from vacuum (ρ = 0) and the concentration of mass (ρ = ∞), then a local-in-time smooth solution can be continued globally in time. The results generalise and strengthen the previous ones in the sense that there is no magnetic field present in the criterion and the assumption on the pressure is significantly relaxed. The proof is based on some new a priori estimates for three-dimensional compressible MHD equations. Copyright © 2022 American Institute of Mathematical Sciences. All rights reserved.