Geodesic
Bifurcation Approach to Analysis of Travelling Waves in Some Taxis–Cross-Diffusion Models
F. Berezovskaya1 ; G. Karev2
1 Howard University, Washington, DC 20059, USA
2 National Center for Biotechnology Information, Bethesda, MD 20894, USA
Mathematical modelling of natural phenomena, Tome 8 (2013) no. 3, pp. 133-153 Cet article a éte moissonné depuis la source EDP Sciences

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An overview of recently obtained authors’ results on traveling wave solutions of some classes of PDEs is presented. The main aim is to describe all possible travelling wave solutions of the equations. The analysis was conducted using the methods of qualitative and bifurcation analysis in order to study the phase-parameter space of the corresponding wave systems of ODEs. In the first part we analyze the wave dynamic modes of populations described by the “growth - taxis - diffusion" polynomial models. It is shown that “suitable" nonlinear taxis can affect the wave front sets and generate non-monotone waves, such as trains and pulses, which represent the exact solutions of the model system. Parametric critical points whose neighborhood displays the full spectrum of possible model wave regimes are identified; the wave mode systematization is given in the form of bifurcation diagrams. In the second part we study a modified version of the FitzHugh-Nagumo equations, which model the spatial propagation of neuron firing. We assume that this propagation is (at least, partially) caused by the cross-diffusion connection between the potential and recovery variables. We show that the cross-diffusion version of the model, besides giving rise to the typical fast travelling wave solution exhibited in the original “diffusion" FitzHugh-Nagumo equations, additionally gives rise to a slow traveling wave solution. We analyze all possible traveling wave solutions of the model and show that there exists a threshold of the cross-diffusion coefficient (for a given speed of propagation), which bounds the area where “normal" impulse propagation is possible. In the third part we describe all possible wave solutions for a class of PDEs with cross-diffusion, which fall in a general class of the classical Keller-Segel models describing chemotaxis. Conditions for existence of front-impulse, impulse-front, and front-front traveling wave solutions are formulated. In particular, we show that a non-isolated singular point in the ODE wave system implies existence of free-boundary fronts.
DOI : 10.1051/mmnp/20138309

F. Berezovskaya 1 ; G. Karev 2

1 Howard University, Washington, DC 20059, USA
2 National Center for Biotechnology Information, Bethesda, MD 20894, USA 
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F. Berezovskaya; G. Karev. Bifurcation Approach to Analysis of Travelling Waves in Some Taxis–Cross-Diffusion Models. Mathematical modelling of natural phenomena, Tome 8 (2013) no. 3, pp. 133-153. doi: 10.1051/mmnp/20138309

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