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Global smooth solutions by transport noise of 3D Navier-Stokes equations with small hyperviscosity
Antonio Agresti · 2024-06-14 · via math.PR updates on arXiv.org

The existence of global smooth solutions to the Navier-Stokes equations (NSEs) with hyperviscosity $(-Δ)^γ$ is open unless $γ$ is close to the J.-L. Lions exponent $ \frac{5}{4}$ at which the energy balance is strong enough to prevent singularity formation. If $1<γ\ll \frac{5}{4}$, then the global well-posedness of the hyperviscous NSEs is widely open as for the usual NSEs. In this paper, for all $γ>1$, we show the existence of a transport noise for which global smooth solutions to the stochastic hyperviscous NSEs on the three-dimensional torus exist with high probability. In particular, a suitable transport noise considerably improves the known well-posedness results in the deterministic setting.

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