Abstract
We exhibit non-unique Leray solutions of the forced Navier–Stokes equations with hypodissipation in two dimensions. Unlike the solutions constructed in Albritton et al. (Ann Math 196(1):415–455, 2022), the solutions we construct live at a supercritical scaling, in which the hypodissipation formally becomes negligible as \(t \rightarrow 0^+\). In this scaling, it is possible to perturb the Euler non-uniqueness scenario of Vishik (Instability and non-uniqueness in the Cauchy problem for the Euler equations of an ideal incompressible fluid. Part I, 2018; Instability and non-uniqueness in the Cauchy problem for the Euler equations of an ideal incompressible fluid. Part II, 2018) to the hypodissipative setting at the nonlinear level. Our perturbation argument is quasilinear in spirit and circumvents the spectral theoretic approach to incorporating the dissipation in Albritton et al. (2022).
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Notes
One must be more careful with the functional set-up in the critical case.
Crucially, this is where we use assumptions on the semigroup \(e^{\tau \varvec{L}_\textrm{ss}}\) generated by the linearized operator. While the above Duhamel formula ‘loses derivatives’ in the sense that we are estimating in \(L^2\) according to ‘higher’ quantities, e.g., \(\Vert \nabla \Omega \Vert _{L^2}\), it is acceptable to lose derivatives at this level, though it will not be acceptable at the ‘top tier’ (\(\Vert \nabla \Omega \Vert _{L^4}\)). This is common in quasi-linear perturbation arguments and can already be seen in standard proofs of local-in-time existence for the Euler equations.
When \(\beta \le 1\), one must argue existence and uniqueness in a quasilinear fashion, whereas when \(\beta \in (1,2)\) it is possible to develop the well-posedness theory in a semilinear fashion.
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Acknowledgements
DA was supported by NSF Postdoctoral Fellowship Grant No. 2002023 and Simons Foundation Grant No. 816048. MC was supported by the SNSF Grant 182565. We thank the anonymous referees for their valuable work.
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Albritton, D., Colombo, M. Non-uniqueness of Leray Solutions to the Hypodissipative Navier–Stokes Equations in Two Dimensions. Commun. Math. Phys. 402, 429–446 (2023). https://doi.org/10.1007/s00220-023-04725-6
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DOI: https://doi.org/10.1007/s00220-023-04725-6