Nonautonomous Kolmogorov parabolic equations with unbounded coefficients

Kunze, Markus; Lorenzi, Luca; Lunardi, Alessandra

doi:10.1090/S0002-9947-09-04738-2

Nonautonomous Kolmogorov parabolic equations with unbounded coefficients
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by Markus Kunze, Luca Lorenzi and Alessandra Lunardi PDF

Trans. Amer. Math. Soc. 362 (2010), 169-198 Request permission

Abstract:

We study a class of elliptic operators $A$ with unbounded coefficients defined in $I\times \mathbb {R}^d$ for some unbounded interval $I\subset \mathbb {R}$. We prove that, for any $s\in I$, the Cauchy problem $u(s,\cdot )=f\in C_b(\mathbb {R}^d)$ for the parabolic equation $D_tu=Au$ admits a unique bounded classical solution $u$. This allows to associate an evolution family $\{G(t,s)\}$ with $A$, in a natural way. We study the main properties of this evolution family and prove gradient estimates for the function $G(t,s)f$. Under suitable assumptions, we show that there exists an evolution system of measures for $\{G(t,s)\}$ and we study the first properties of the extension of $G(t,s)$ to the $L^p$-spaces with respect to such measures.

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