Large time behavior of nonlocal aggregation models with nonlinear diffusion

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December 2008, 3(4): 749-785. doi: 10.3934/nhm.2008.3.749

Large time behavior of nonlocal aggregation models with nonlinear diffusion

Martin Burger ^1, and Marco Di Francesco ^2,

1.	Westfälische Wilhelms-Universität Münster, Institutfür Numerische und Angewandte Mathematik, Einsteinstr. 62, D 48149 Münster, Germany
2.	Division of Mathematics for Engineering, Piazzale E. Pontieri, 2 Monteluco di Roio, 67040 L'Aquila, Italy

Received November 2007 Revised May 2008 Published October 2008

Abstract
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The aim of this paper is to establish rigorous results on the large time behavior of nonlocal models for aggregation, including the possible presence of nonlinear diffusion terms modeling local repulsions. We show that, as expected from the practical motivation as well as from numerical simulations, one obtains concentrated densities (Dirac $\delta$ distributions) as stationary solutions and large time limits in the absence of diffusion. In addition, we provide a comparison for aggregation kernels with infinite respectively finite support. In the first case, there is a unique stationary solution corresponding to concentration at the center of mass, and all solutions of the evolution problem converge to the stationary solution for large time. The speed of convergence in this case is just determined by the behavior of the aggregation kernels at zero, yielding either algebraic or exponential decay or even finite time extinction. For kernels with finite support, we show that an infinite number of stationary solutions exist, and solutions of the evolution problem converge only in a measure-valued sense to the set of stationary solutions, which we characterize in detail.
Moreover, we also consider the behavior in the presence of nonlinear diffusion terms, the most interesting case being the one of small diffusion coefficients. Via the implicit function theorem we give a quite general proof of a rather natural assertion for such models, namely that there exist stationary solutions that have the form of a local peak around the center of mass. Our approach even yields the order of the size of the support in terms of the diffusion coefficients.
All these results are obtained via a reformulation of the equations considered using the Wasserstein metric for probability measures, and are carried out in the case of a single spatial dimension.

Keywords: Wasserstein metric, asymptotic behavior, biological aggregation, nonlocal PDEs, stationary solutions, Nonlinear diffusion.

Mathematics Subject Classification: 35B30, 35B40, 35B41, 45K05, 92D25.

Citation: Martin Burger, Marco Di Francesco. Large time behavior of nonlocal aggregation models with nonlinear diffusion. Networks & Heterogeneous Media, 2008, 3 (4) : 749-785. doi: 10.3934/nhm.2008.3.749

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