Blowup threshold and collapse mass separation for a drift-diffusion system in space-dimension two

We study a drift-diffusion system on bounded domain in twospace dimension. This model is provided with a hetero-separative and homoaggregative feature subject to a gradient of physical or chemical potential which is proportional to their densities. We extend a criterion of global-in-time existence of the solution, especially for non-radially symmetric case. Then we perform the blowup analysis such as the formation of collapses and collapse mass separations. A slightly different model describing cross chemotaxis is also discussed.