Bifurcation of hexagonal patterns in a chemotaxis-diffusion-growth system

In this paper, we study a chemotaxis-diffusion-growth system in a rectangular domain by applying the center manifold theory. It is observed that the trivial solutions are destabilized due to the chemotaxis term. As a result, we obtain the normal form on the center manifold, and it is proved that the locally asymptotically stable hexagonal patterns exist.