Abstract
This paper is to study global-in-time existence of weak solutions to zero Mach number system which derives from the full Navier-Stokes system, under a special relationship between the viscosity coefficient and the heat conductivity coefficient such that, roughly speaking, the source term in the equation for the newly introduced divergence-free velocity vector field vanishes. In dimension two, thanks to a local-in-time existence result of a unique strong solution in critical Besov spaces given in \cite{Danchin-Liao}, for arbitrary large initial data, we will show that this unique strong solution exists globally in time, by a weak-strong uniqueness argument.
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