## Differential and Integral Equations

### Global existence in sub-critical cases and finite time blow-up in super-critical cases to degenerate Keller-Segel systems

Yoshie Sugiyama

#### Abstract

We consider the degenerate Keller-Segel system (KS) of Nagai type below. We prove that when $m > 2-\frac{2}{N}$, the problem (KS) is solvable globally in time without any restriction on the size of the initial data and that when $1 < m \le 2-\frac{2}{N}$, the problem (KS) evolves in a finite time blow-up for some large initial data. Hence, we completely classify the existence and non-existence of the time global solution by means of the exponent $m=2-\frac{2}{N}$, which generalizes the Fujita exponent for (KS).

#### Article information

Source
Differential Integral Equations, Volume 19, Number 8 (2006), 841-876.

Dates
First available in Project Euclid: 21 December 2012