We study weak solutions of the 3D Navier–Stokes equations with initial data. We prove that is locally integrable in space–time for any real α such that . Up to now, only the second derivative was known to be locally integrable by standard parabolic regularization. We also present sharp estimates of those quantities in weak-. These estimates depend only on the -norm of the initial data and on the domain of integration. Moreover, they are valid even for as long as u is smooth. The proof uses a standard approximation of Navier–Stokes from Leray and blow-up techniques. The local study is based on De Giorgi techniques with a new pressure decomposition. To handle the non-locality of fractional Laplacians, Hardy space and Maximal functions are introduced.
@article{AIHPC_2014__31_5_899_0, author = {Choi, Kyudong and Vasseur, Alexis F.}, title = {Estimates on fractional higher derivatives of weak solutions for the Navier--Stokes equations}, journal = {Annales de l'I.H.P. Analyse non lin\'eaire}, volume = {31}, year = {2014}, pages = {899-945}, doi = {10.1016/j.anihpc.2013.08.001}, mrnumber = {3258360}, zbl = {1297.76047}, language = {en}, url = {http://dml.mathdoc.fr/item/AIHPC_2014__31_5_899_0} }
Choi, Kyudong; Vasseur, Alexis F. Estimates on fractional higher derivatives of weak solutions for the Navier–Stokes equations. Annales de l'I.H.P. Analyse non linéaire, Tome 31 (2014) pp. 899-945. doi : 10.1016/j.anihpc.2013.08.001. http://gdmltest.u-ga.fr/item/AIHPC_2014__31_5_899_0/
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