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On higher differentiability of solutions of parabolic systems with discontinuous coefficients and (p, q)-growth

Part of: Partial differential equations Parabolic equations and systems Miscellaneous topics - Partial differential equations

Published online by Cambridge University Press:  26 January 2019

Flavia Giannetti ,
Antonia Passarelli di Napoli  and
Christoph Scheven
Flavia Giannetti
Affiliation:
Dipartimento di Matematica e Applicazioni ‘R. Caccioppoli’, Università di Napoli ‘Federico II’, via Cintia - 80126, Napoli, Italy ([email protected]; [email protected])
Antonia Passarelli di Napoli
Affiliation:
Dipartimento di Matematica e Applicazioni ‘R. Caccioppoli’, Università di Napoli ‘Federico II’, via Cintia - 80126, Napoli, Italy ([email protected]; [email protected])
Christoph Scheven
Affiliation:
Faculty for Mathematics, University Duisburg-Essen, D-45117 Essen, Germany ([email protected])
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Abstract

We consider weak solutions $u:\Omega _T\to {\open R}^N$ to parabolic systems of the type

$$u_t-{\rm div}\;a(x,t,Du) = 0\quad {\rm in}\;\Omega _T = \Omega \times (0,T),$$
where the function a(x, t, ξ) satisfies (p, q)-growth conditions. We give an a priori estimate for weak solutions in the case of possibly discontinuous coefficients. More precisely, the partial maps $x\mapsto a(x,t,\xi )$ under consideration may not be continuous, but may only possess a Sobolev-type regularity. In a certain sense, our assumption means that the weak derivatives $D_xa(\cdot ,\cdot ,\xi )$ are contained in the class $L^\alpha (0,T;L^\beta (\Omega ))$, where the integrability exponents $\alpha ,\beta $ are coupled by
$$\displaystyle{{p(n + 2)-2n} \over {2\alpha }} + \displaystyle{n \over \beta } = 1-\kappa $$
for some κ ∈ (0,1). For the gap between the two growth exponents we assume
$$2 \les p < q \les p + \displaystyle{{2\kappa } \over {n + 2}}.$$
Under further assumptions on the integrability of the spatial gradient, we prove a result on higher differentiability in space as well as the existence of a weak time derivative $u_t\in L^{p/(q-1)}_{{\rm loc}}(\Omega _T)$. We use the corresponding a priori estimate to deduce the existence of solutions of Cauchy–Dirichlet problems with the mentioned higher differentiability property.

Keywords

Parabolic systemshigher differentiabilitydiscontinuous coefficients

MSC classification

Primary: 35B65: Smoothness and regularity of solutions
Secondary: 35K40: Second-order parabolic systems 35K92: Quasilinear parabolic equations with $p$-Laplacian 35R05: Partial differential equations with discontinuous coefficients or data
Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 150 , Issue 1 , February 2020 , pp. 419 - 451
Copyright
Copyright © Royal Society of Edinburgh 2019

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