Abstract
This paper studies the dynamical properties of the chemotaxis system(â){ut=ÎuâÏââ (uâv)+ruâÎŒu2,xâΩ,t>0,vt=Îvâv+u,xâΩ,t>0, under homogeneous Neumann boundary conditions in bounded convex domains ΩâRn, nâ„1, with positive constants Ï, r and ÎŒ.Numerical simulations but also some rigorous evidence have shown that depending on the relative size of r, ÎŒ and |Ω|, in comparison to the well-understood case when Ï=0, this problem may exhibit quite a complex solution behavior, including unexpected effects such as asymptotic decay of the quantity u within large subdomains of Ω.The present work indicates that any such extinction phenomenon, if occurring at all, necessarily must be of spatially local nature, whereas the population as a whole always persists. More precisely, it is shown that for any nonnegative global classical solution (u,v) of (â) with uâą0 one can find mâ>0 such thatâ«Î©u(x,t)dxâ„mâfor all t>0. The proof is based on an, in this context, apparently novel analysis of the functional â«Î©lnâĄu, deriving a lower bound for this quantity along a suitable sequence of times by appropriately exploiting a differential inequality for a suitable linear combination of â«Î©lnâĄu, â«Î©u and â«Î©v2.
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