## Differential and Integral Equations

### Sharp analytic-Gevrey regularity estimates down to $t=0$ for solutions to semilinear heat equations

#### Abstract

We study the Gevrey regularity down to $t=0$ of solutions to the initial-value problem for the semilinear heat equation $\partial_tu-\Delta u+F[u]=0$ with polynomial non-linearities. The approach is based on suitable iterative fixed point methods in $L^p$-based Banach spaces with anisotropic Gevrey norms with respect to the time and space variables. We also construct explicit solutions uniformly analytic in $t\geq 0$ and $x\in {\mathbb R}^n$ for some conservative non-linear terms with symmetries.

#### Article information

Source
Differential Integral Equations, Volume 21, Number 7-8 (2008), 771-799.

Dates
First available in Project Euclid: 20 December 2012

Gramchev, Todor; Łysik, Grzegorz. Sharp analytic-Gevrey regularity estimates down to $t=0$ for solutions to semilinear heat equations. Differential Integral Equations 21 (2008), no. 7-8, 771--799. https://projecteuclid.org/euclid.die/1356038622