New bounds for the inhomogenous Burgers and the Kuramoto-Sivashinsky equations
Résumé
We give a substantially simplified proof of near-optimal
estimate on the Kuramoto-Sivashinsky equation from [F. Otto, "Optimal bounds on the Kuramoto-Sivashinsky equation", JFA 2009], at the same time slightly
improving the result. The result in the above cited paper relied on two ingredients: a regularity
estimate for capillary Burgers and an a novel priori estimate for the inhomogeneous inviscid
Burgers equation, which works out that in many ways the {\it conservative transport} nonlinearity
acts as a t coercive term. It is the proof of the second ingredient that we substantially
simplify by proving a modified K\'arm\'an-Howarth-Monin identity for solutions of the inhomogeneous inviscid Burgers equation. This gives a new interpretation of the results obtained in [F. Golse, B. Perthame "Optimal regularizing effect for scalar conservation laws", Rev. Mat. Iber., 2013].
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