On area integral estimates for solutions to parabolic systems in time-varying and non-smooth cylinders

Nyström, Kaj

doi:10.1090/S0002-9947-07-04328-0

On area integral estimates for solutions to parabolic systems in time-varying and non-smooth cylinders
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Trans. Amer. Math. Soc. 360 (2008), 2987-3017 Request permission

Abstract:

In this paper we prove results relating the (parabolic) non-tangen- tial maximum operator and appropriate square functions in $L^p$ for solutions to general second order, symmetric and strongly elliptic parabolic systems with real valued and constant coefficients in the setting of a class of time-varying, non-smooth infinite cylinders $\Omega$. In particular we prove a global as well as a local and scale invariant equivalence between the parabolic non-tangential maximal operator and appropriate square functions for solutions of our system. The novelty of our approach is that it is not based on singular integrals, the prevailing tool in the analysis of systems in non-smooth domains. Instead the methods explored have recently proved useful in the analysis of elliptic measure associated to non-symmetric operators through the work of Kenig-Koch-Pipher-Toro and in the analysis of caloric measure without the use of layer potentials.

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