Maximal Lp regularity for nonautonomous parabolic equations in extrapolation spaces

This paper deals with a parabolic problem u' (t)=A (t) u (t)+f (t), u (0)=x, on a Banach space X. We establish maximal L-p regularity, p is an element of[1,+infinity[, on a suitable extrapolation space of X. As a consequence we obtain weak solutions that have the same regularity of the mild solutions in the autonomous case.