Parabolic equation in time and space dependent anisotropic Musielak-Orlicz spaces in absence of Lavrentiev's phenomenon

Abstract

We study a general nonlinear parabolic equation on a Lipschitz bounded domain in ${\mathbb{R}}^N$, \begin{equation*} \left\{\begin{array}{l l} \partial_t u-\mathrm{div} A(t,x,\nabla u)= f(t,x)&\text{in}\ \ Ω_T,\\ u(t,x)=0 &\ \mathrm{ on} \ (0,T)\times\partialΩ,\\ u(0,x)=u_0(x)&\text{in}\ Ω, \end{array}\right. \end{equation*} with $f\in L^{\infty }({\Omega }_T)$ and $u_0\in L^{\infty }(\Omega )$. The growth of the monotone vector field $A$ is controlled by a generalized fully anisotropic $N$-function $M:[0,T)\times \Omega \times {\mathbb{R}}^N\to [0,\infty )$ inhomogeneous in time and space, and under no growth restrictions on the last variable. It results in the need of the integration by parts formula which has to be formulated in an advanced way. Existence and uniqueness of solutions are proven when the Musielak-Orlicz space is reflexive OR in absence of Lavrentiev's phenomenon. To ensure approximation properties of the space we impose natural assumption that the asymptotic behaviour of the modular function is sufficiently balanced. Its instances are log-Hölder continuity of variable exponent or optimal closeness condition for powers in double phase spaces. The noticeable challenge of this paper is cosidering the problem in non-reflexive and inhomogeneous fully anisotropic space that changes along time.

arXiv admin note: text overlap with arXiv:1707.06097

References in corpus (1)

• A pocket guide to nonlinear differential equations in the Musielak--Orlicz spaces

Cited by in corpus (5)

• A pocket guide to nonlinear differential equations in the Musielak--Orlicz spaces
• On a range of exponents for absence of Lavrentiev phenomenon for double phase functionals
• Renormalized solutions to parabolic equations in time and space dependent anisotropic Musielak-Orlicz spaces in absence of Lavrentiev's phenomenon
• A fundamental condition for harmonic analysis in anisotropic generalized Orlicz spaces
• An extended variational theory for nonlinear evolution equations via modular spaces