Well-posedness and exponential mixing for stochastic magneto-hydrodynamic equations with fractional dissipations

Abstract

Consider d-dimensional magneto-hydrodynamic (MHD) equations with fractional dissipations driven by multiplicative noise. First, we prove the existence of martingale solutions for stochastic fractional MHD equations in the case of d = 2, 3 and \alpha \wedge \beta \rangle \mathrm{0}, where \alpha ,\beta are the parameters of the fractional dissipations in the equation. Second, for d = 2, 3 and \alpha \wedge \beta \ge {\displaystyle \frac{\mathrm{1}}{\mathrm{2}}}+{\displaystyle \frac{d}{\mathrm{4}}}, we show the pathwise uniqueness of solutions and then obtain the existence and uniqueness of strong solutions using the Yamada-Watanabe theorem. Furthermore, we establish the exponential mixing property for stochastic MHD equations with degenerate multiplicative noise when d = 2, 3 and \alpha \wedge \beta \ge {\displaystyle \frac{\mathrm{1}}{\mathrm{2}}}+{\displaystyle \frac{d}{\mathrm{4}}}.

Key words： Magneto-hydrodynamic (MHD) equation; martingale solution; degenerate noise; ergodicity; exponential mixing

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