On evolutionary problems with a-priori bounded gradients
| Type of publication: | Misc |
| Citation: | |
| Publication status: | Submitted |
| Year: | 2021 |
| Abstract: | We study a nonlinear evolutionary partial differential equation that can be viewed as a generalization of the heat equation where the temperature gradient is a~priori bounded but the heat flux provides merely \mbox{$L^1$-coercivity}. Applying higher differentiability techniques in space and time, choosing a special weighted norm (equivalent to the Euclidean norm in $\mathbb{R}^d$), incorporating finer properties of integrable functions and using the concept of renormalized solution, we prove long-time and large-data existence and uniqueness of weak solution, with an $L^1$-integrable flux, to an initial spatially-periodic problem for all values of a positive model parameter. If this parameter is smaller than $2/(d+1)$, where $d$ denotes the spatial dimension, we obtain higher integrability of the flux. As the developed approach is not restricted to a scalar equation, we also present an analogous result for nonlinear parabolic systems in which the nonlinearity, being the gradient of a strictly convex function, gives an a-priori $L^\infty$-bound on the gradient of the unknown solution. |
| Preprint project: | NCMM |
| Preprint year: | 2021 |
| Preprint number: | 02 |
| Preprint ID: | NCMM/2021/02 |
| Keywords: | $\infty$-Laplacian, a~priori bounded gradient, existence, nonlinear parabolic equation, renormalized solution, uniqueness, weak solution |
| Authors | |
| Added by: | [MB] |
| Total mark: | 0 |
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