M. Oliver et Es. Titi, Remark on the rate of decay of higher order derivatives for solutions to the Navier-Stokes equations in R-n, J FUNCT ANA, 172(1), 2000, pp. 1-18
We present a new derivation of upper bounds for the decay of higher order d
erivatives of solutions to the unforced Navier-Stokes equations in R-n. The
method, based on so-called Gevrey estimates, also yields explicit bounds o
n the growth of the radius of analyticity of the solution in time. Moreover
, under the assumption that the Navier-Stokes solution stays sufficiently c
lose to a solution of the heat equation in the L-2 norm-a result known to b
e true for a large class of initial data-lower bounds on the decay of highe
r order derivatives can be obtained. (C) 2000 Academic Press.