摘 要:在齊次Neumann邊界條件下,考慮了具有奇異靈敏度和間接信號產(chǎn)生機(jī)制的拋物-拋物-ODE趨化模型。當(dāng)模型中的參數(shù)滿足一定的條件時,已有文獻(xiàn)給出解的整體存在性,而解的一致有界性尚未可知。因此,文中給出該模型解的一致有界性的嚴(yán)格證明。利用該模型已有解的第二個分量的一致下界估計(jì),再運(yùn)用Young不等式、Gagliardo-Nirenberg不等式、插值不等式等工具得到解的整體存在性和一致有界性的充分條件。
關(guān)鍵詞:整體存在性;一致有界性;趨化;奇異靈敏度;間接信號產(chǎn)生
中圖分類號:O175.26 文獻(xiàn)標(biāo)志碼:A 文章編號:1673-5072(2024)06-0600-06
近年來,由于氣候變暖,加拿大西部森林中的山松甲殼蟲快速繁殖,給森林造成了極大的危害。飛行的山松甲殼蟲在松樹上筑巢并產(chǎn)卵,隨著時間的推移,幼蟲長為成蟲,離開巢穴尋找下一批松樹筑巢并產(chǎn)卵。期間,在松樹上筑巢的山松甲殼蟲會釋放化學(xué)信息素吸引飛行的山松甲殼蟲。為了描述這一現(xiàn)象,Strohm等[1]提出了如下模型:
參考文獻(xiàn):
[1] STROHM S,TYSON R C,POWELL J A.Pattern formation in a model for mountain pine beetle dispersal:linking model predictions to data[J].Bulletin of Mathematical Biology,2013,75(10):1778-1787.
[2] TAO Y,WINKLER M.Critical mass for infinite-time aggregation in a chemotaxis model with indirect signal production[J].Journal of the European Mathematical Society,2017,19(12):3641-3678.
[3] LANRENCOT P.Global bounded and unbounded solutions to a chemotaxis system with indirect signal production[J].Discrete and Continuous Dynamical Systems.Series B,2019,24(12):6419-6444.
[4] 王笑丹,陶有山.具間接信號產(chǎn)出的二維趨向性模型古典解的整體存在性和有界性[J].東華大學(xué)學(xué)報(bào)(自然科學(xué)版),2016,42(6):922-930.
[5] 劉冬梅.二維空間中具間接信號產(chǎn)出趨化模型解的整體存在性[J].東華大學(xué)學(xué)報(bào)(自然科學(xué)版),2016,42(1):137-144.
[6] FUJIE K,SENBA T.Application of an Adams type inequality to a two-chemical substances chemotaxis system[J].Journal of Differential Equations,2017,263(1):88-148.
[7] FUJIE K,SENBA T.Blowup of solutions to a two-chemical substances chemotaxis system in the critical dimension[J].Journal of Differential Equations,2019,266(3):942-976.
[8] FUEST M,LANKEIT J,TANAKA Y.Critical mass phenomena in higher dimensional quasilinear Keller-Segel systems with indirect signal production[J].Mathematical Methods in the Applied Sciences,2023,46(13):14362-14378.
[9] 高鵬.兩類具有奇異敏感函數(shù)的趨化模型解的性質(zhì)研究[D].伊寧:伊犁師范大學(xué),2023.
[10]LI H,TAO Y.Boundedness in a chemotaxis system with indirect signal production and generalized logistic source[J].Applied Mathematics Letters,2018,77:108-113.
[11]BELLOMO N,BELLOUQUID A,TAO Y,et al.Toward a mathematical theory of Keller-Segel models of pattern formation in biological tissues[J].Mathematical Models and Methods in Applied Sciences,2015,25(9):1663-1763.
[12]WINKLER M.A three-dimensional Keller-Segel-Navier-Stokes system with logistic source:global weak solutions and asymptotic stabilization[J].Journal of Functional Analysis,2019,276(5):1339-1401.
[13]FUJIE K.Boundedness in a fully parabolic chemotaxis system with singular sensitivity[J].Journal of Mathematical Analysis and Applications,2015,424(1):675-684.
[14]LANKEIT L.A new approach toward boundedness in a two-dimensional parabolic chemotaxis system with singular sensitivity[J].Mathematical Methods in the Applied Sciences,2016,39(3):394-404.
[15]NAGAI T,SENBA T,YOSHIDA K.Application of the Trudinger-Moser inequality to a parabolic system of chemotaxis[J].Funkcialaj Ekvacioj,1997,40(3):411-433.
Boundedness of Solutions for Chemotaxis Model with Singular Sensitivity
YANG Lan1,LI Zhong-ping2
(1.School of Mathematical Sciences,University of Electronic Science and Technology of China,Chengdu Sichuan 611731,China;2.School of Mathematics and Information,China West Normal University,Nanchong Sichuan 637009,China)
Abstract:This paper talks about a parabolic-parabolic-ODE chemotaxis model with singular sensitivity and indirect signal production mechanism under homogeneous Neumann boundary conditions.Previous literature showed the global existence of the solutions when the parameters in this model satisfy certain conditions.Howeves,the uniform boundedness of solutions is unknown.In this paper,the uniform boundedness of the solutions is further considered.The sufficient conditions for the global existence and uniform boundedness of the solutions can be obtained by employing the uniform lower bound estimate of the second solution component,Young inequality,Gagliardo-Nirenberg inequality and interpolation inequality.
Keywords:global existence;uniform boundedness;chemotaxis;singular sensitivity;indirect signal production