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Dispersive estimates for the stably stratified Boussinesq equations
Takada, Ryo,Lee, Sanghyuk Indiana University Mathematics Journal 2017 Indiana University mathematics journal Vol.66 No.6
<P>We consider the initial value problem for the 3D Boussinesq equations for stably stratified fluids without the rotational effect. We establish the sharp dispersive estimate for the linear propagator related to the stable stratification. As an application, we give the explicit relation between the size of initial data and the buoyancy frequency which ensures the unique existence of global solutions to our system. In particular, it is shown that the size of the initial thermal disturbance can be taken in proportion to the strength of stratification.</P>