<p style='text-indent:20px;'>In this paper we focus on this attraction-repulsion chemotaxis model with consumed signals</p><p style='text-indent:20px;'><disp-formula><label/><tex-math id="FE1"> \begin{document}$\begin{equation}\label{problem_abstract}\tag{$\Diamond$}\begin{cases}u_t = \Delta u - \chi \nabla \cdot (u \nabla v)+\xi \nabla \cdot (u \nabla w) & \text{ in }~~ \Omega \times (0, T_{max}), \\v_t = \Delta v- uv & \text{ in }~~ \Omega \times (0, T_{max}), \\w_t = \Delta w- uw & \text{ in }~~ \Omega \times (0, T_{max}), \end{cases}\end{equation}$ \end{document}</tex-math></disp-formula></p><p style='text-indent:20px;'>formulated in a bounded and smooth domain <inline-formula><tex-math id="M2">\begin{document}$ \Omega $\end{document}</tex-math></inline-formula> of <inline-formula><tex-math id="M3">\begin{document}$ {\mathbb R}^n $\end{document}</tex-math></inline-formula>, with <inline-formula><tex-math id="M4">\begin{document}$ n\geq 2 $\end{document}</tex-math></inline-formula>, for some positive real numbers <inline-formula><tex-math id="M5">\begin{document}$ \chi, \xi $\end{document}</tex-math></inline-formula> and with <inline-formula><tex-math id="M6">\begin{document}$ {T_{max}}\in (0, \infty] $\end{document}</tex-math></inline-formula>. Once equipped with appropriately smooth initial distributions <inline-formula><tex-math id="M7">\begin{document}$ u(x, 0) = u_0(x)\geq 0 $\end{document}</tex-math></inline-formula>, <inline-formula><tex-math id="M8">\begin{document}$ v(x, 0) = v_0(x)\geq 0 $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M9">\begin{document}$ w(x, 0) = w_0(x)\geq 0 $\end{document}</tex-math></inline-formula>, as well as Neumann boundary conditions, we establish sufficient assumptions on its data yielding global and bounded classical solutions; these are functions <inline-formula><tex-math id="M10">\begin{document}$ u, v $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M11">\begin{document}$ w $\end{document}</tex-math></inline-formula>, with zero normal derivative on <inline-formula><tex-math id="M12">\begin{document}$ \partial \Omega\times (0, {T_{max}}) $\end{document}</tex-math></inline-formula>, satisfying pointwise the equations in problem <inline-formula><tex-math id="M13">\begin{document}$\Diamond$\end{document}</tex-math></inline-formula> with <inline-formula><tex-math id="M14">\begin{document}$ {T_{max}} = \infty $\end{document}</tex-math></inline-formula>. This is proved for any such initial data, whenever <inline-formula><tex-math id="M15">\begin{document}$ \chi $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M16">\begin{document}$ \xi $\end{document}</tex-math></inline-formula> belong to bounded and open intervals, depending respectively on <inline-formula><tex-math id="M17">\begin{document}$ \|v_0\|_{L^{\infty}(\Omega)} $\end{document}</tex-math></inline-formula> and <inline-formula><tex-math id="M18">\begin{document}$ \|w_0\|_{L^{\infty}(\Omega)} $\end{document}</tex-math></inline-formula>. Finally, we illustrate some aspects of the dynamics present within the chemotaxis system by means of numerical simulations.</p>
In this paper we focus on this attraction-repulsion chemotaxis model with consumed signalsformulated in a bounded and smooth domain Ω of R n , with n ≥ 2, for some positive real numbers χ, ξ and with Tmax ∈ (0, ∞].Once equipped with appropriately smooth initial distributions u(x, 0) = u 0 (x) ≥ 0, v(x, 0) = v 0 (x) ≥ 0 and w(x, 0) = w 0 (x) ≥ 0, as well as Neumann boundary conditions, we establish sufficient assumptions on its data yielding global and bounded classical solutions; these are functions u, v and w, with zero normal derivative on ∂Ω × (0, Tmax), pointwisely satisfying the equations in problem (✸) with Tmax = ∞. This is proved: 1) for any such initial data, whenever χ and ξ belong to bounded and open intervals, depending respectively on v 0 L ∞ (Ω) and w 0 L ∞ (Ω) ; 2) for a wider (but also bounded) interval of ξ, provided a further largeness assumption on the minimum of w 0 in Ω is imposed; 3) for an interval of ξ arbitrarily extendable, whenever the mentioned largeness assumption on the minimum of w 0 in Ω is preserved, and as long as also w 0 L ∞ (Ω) is allowed to indefinitely increase. Lastly, we conclude the article discussing our results in the frame of others available in the literature; specifically, in the more restricted class of initial data u 0 , v 0 , w 0 such that χv 0 − ξw 0 ≥ 0, model (✸) may be also faced by considering a natural transformation and then adapting already known theorems. Again with regard to the boundeness of its solutions, the aforementioned transformation yields such a property for sharper conditions on χv 0 − ξw 0 L ∞ (Ω) than those directly obtained with our approach, when the initial data are taken in accordance to items 1) and 2). Conversely, for those data complying with restrictions in item 3), the situation changes and, making the most from the repulsive coefficient ξ, our strategy provides a milder condition.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
customersupport@researchsolutions.com
10624 S. Eastern Ave., Ste. A-614
Henderson, NV 89052, USA
This site is protected by reCAPTCHA and the Google Privacy Policy and Terms of Service apply.
Copyright © 2024 scite LLC. All rights reserved.
Made with 💙 for researchers
Part of the Research Solutions Family.