Local existence for variable-coefficient 3D Euler at optimal regularity r>2.5, plus a BKM blow-up criterion at r=3 involving BMO vorticity and H1 velocity.
Almost global existence for the stochastic Navier-Stokes equations with small $H^{1/2}$ data
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abstract
We address the global existence of solutions to the stochastic Navier-Stokes equations with multiplicative noise and with initial data in $H^{1/2}(\mathbb{T}^{3})$. We prove that the solution exists globally in time with probability arbitrarily close to~$1$ if the initial data and noise are sufficiently small. If the noise is not assumed to be small, then the solution is global on a sufficiently small deterministic time interval with probability arbitrarily close to~$1$.
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The Euler equations with variable coefficients
Local existence for variable-coefficient 3D Euler at optimal regularity r>2.5, plus a BKM blow-up criterion at r=3 involving BMO vorticity and H1 velocity.