In this paper we describe a new method to derive different type of decay estimates for solutions of evolution equations which allow to describe the asymptotic behavior of the solutions both in presence or absence of "immediate" regularizing properties. Moreover, we give various examples of applications some of which new and dealing with a class of nonlinear problems with degenerate coercivity.
In this paper we study the regularity, the uniqueness and the asymptotic behavior of the solutions to a class of nonlinear operators in dependence of the summability properties of the datum f and of the initial datum $u_0$. The case of only summable data f and $u_0$ is allowed. We prove that these equations satisfy surprising regularization phenomena. Moreover we prove estimates (depending continuously from the data) that for zero datum f become well known decay (or ultracontractive) estimates.
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