Universal estimate of the gradient for parabolic equations

Details Universal estimate of the gradient for parabolic equations Universal estimate of the gradient for parabolic equations

2007-09-06

arxiv.org/abs/0709.0870v6

Journal of Physics A: Mathematical and Theoretical (2008) 41, No. 21, 215202 (12pp)

Mathematics

Analysis of PDEs

15 pages

Scientific paper

10.1088/1751-8113/41/21/215202

We suggest a modification of the estimate for weighted Sobolev norms of solutions of parabolic equations such that the matrix of the higher order coefficients is included into the weight for the gradient. More precisely, we found the upper limit estimate that can be achieved by variations of the zero order coefficient. As an example of applications, an asymptotic estimate was obtained for the gradient at initial time. The constant in the estimates is the same for all possible choices of the dimension, domain, time horizon, and the coefficients of the parabolic equation. As an another example of application, existence and regularity results are obtained for parabolic equations with time delay for the gradient.

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