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Steady states and pattern formation of the density-suppressed motility model
Wang, Zhi An1; Xu, Xin2,3
2021-05-24
Source PublicationIMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications)
ISSN0272-4960
Volume86Issue:3Pages:577-603
Abstract

This paper considers the stationary problem of density-suppressed motility models proposed in Fu et al. (2012) and Liu et al. (2011) in one dimension with Neumman boundary conditions. The models consist of parabolic equations with cross-diffusion and degeneracy. We employ the global bifurcation theory and Helly compactness theorem to explore the conditions under which non-constant stationary (pattern) solutions exist and asymptotic profiles of solutions as some parameter value is small. When the cell growth is not considered, we are able to show the monotonicity of solutions and hence achieve a global bifurcation diagram by treating the chemical diffusion rate as a bifurcation parameter. Furthermore, we show that the solutions have boundary spikes as the chemical diffusion rate tends to zero and identify the conditions for the non-existence of non-constant solutions. When transformed to specific motility functions, our results indeed give sharp conditions on the existence of non-constant stationary solutions. While with the cell growth, the structure of global bifurcation diagram is much more complicated and in particular the solution loses the monotonicity property. By treating the growth rate as a bifurcation parameter, we identify a minimum range of growth rate in which non-constant stationary solutions are warranted, while a global bifurcation diagram can still be attained in a special situation. We use numerical simulations to test our analytical results and illustrate that patterns can be very intricate and stable stationary solutions may not exist when the parameter value is outside the minimal range identified in our paper.

KeywordDensity-suppressed Motility Global Bifurcation Theory Helly Compactness Theorem Pattern Formation Stationary Solutions
DOI10.1093/imamat/hxab006
URLView the original
Indexed BySCIE
Language英語English
WOS Research AreaMathematics
WOS SubjectMathematics, Applied
WOS IDWOS:000670952800007
PublisherOXFORD UNIV PRESSGREAT CLARENDON ST, OXFORD OX2 6DP, ENGLAND
Scopus ID2-s2.0-85108159207
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Citation statistics
Document TypeJournal article
CollectionDEPARTMENT OF MATHEMATICS
Faculty of Science and Technology
Corresponding AuthorWang, Zhi An
Affiliation1.Department of Applied Mathematics, The Hong Kong Polytechnic University, Hung Hom, Hong Kong
2.Department of Mathematics, Faculty of Science and Technology, University of Macau, Taipa, Macao
3.Department of Mathematics, Southern University of Science and Technology, Shenzhen, 999078, China
Recommended Citation
GB/T 7714
Wang, Zhi An,Xu, Xin. Steady states and pattern formation of the density-suppressed motility model[J]. IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications), 2021, 86(3), 577-603.
APA Wang, Zhi An., & Xu, Xin (2021). Steady states and pattern formation of the density-suppressed motility model. IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications), 86(3), 577-603.
MLA Wang, Zhi An,et al."Steady states and pattern formation of the density-suppressed motility model".IMA Journal of Applied Mathematics (Institute of Mathematics and Its Applications) 86.3(2021):577-603.
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