<p>This paper deals with the following parabolic-elliptic chemotaxis system with singular sensitivity and nonlinear signal production, <Equation ID="Equ1"> <EquationNumber>0.1</EquationNumber> <MediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_Equ1.gif" Format="GIF" Height="43" Rendition="HTML" Resolution="72" Type="Linedraw" Width="397" /> </MediaObject> <EquationSource Format="TEX">\(\begin{aligned} \left\{ \begin{array}{llll} u_t=\Delta u-\chi \nabla \cdot (\frac{u}{v^\gamma }\nabla v)+\lambda u-\mu u^k,\quad &amp; x\in \Omega ,\quad t&gt;0,\\ 0=\Delta v-v+u^\alpha ,\quad &amp; x\in \Omega ,\quad t&gt;0,\\ \end{array} \right. \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mfenced open="{"> <mrow> <mtable> <mtr> <mtd columnalign="left"> <mrow> <msub> <mi>u</mi> <mi>t</mi> </msub> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>u</mi> <mo>-</mo> <mi>χ</mi> <mi mathvariant="normal">∇</mi> <mo>·</mo> <mrow> <mo stretchy="false">(</mo> <mfrac> <mi>u</mi> <msup> <mi>v</mi> <mi>γ</mi> </msup> </mfrac> <mi mathvariant="normal">∇</mi> <mi>v</mi> <mo stretchy="false">)</mo> </mrow> <mo>+</mo> <mi>λ</mi> <mi>u</mi> <mo>-</mo> <mi>μ</mi> <msup> <mi>u</mi> <mi>k</mi> </msup> <mo>,</mo> <mspace width="1em" /> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mi>x</mi> <mo>∈</mo> <mi mathvariant="normal">Ω</mi> <mo>,</mo> <mspace width="1em" /> <mi>t</mi> <mo>&gt;</mo> <mn>0</mn> <mo>,</mo> </mrow> </mtd> </mtr> <mtr> <mtd columnalign="left"> <mrow> <mrow /> <mn>0</mn> <mo>=</mo> <mi mathvariant="normal">Δ</mi> <mi>v</mi> <mo>-</mo> <mi>v</mi> <mo>+</mo> <msup> <mi>u</mi> <mi>α</mi> </msup> <mo>,</mo> <mspace width="1em" /> </mrow> </mtd> <mtd columnalign="left"> <mrow> <mi>x</mi> <mo>∈</mo> <mi mathvariant="normal">Ω</mi> <mo>,</mo> <mspace width="1em" /> <mi>t</mi> <mo>&gt;</mo> <mn>0</mn> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </mfenced> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>under homogeneous Neumann boundary conditions and suitable initial value conditions where <InlineEquation ID="IEq1"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq1.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="55" /> </InlineMediaObject> <EquationSource Format="TEX">\(\Omega \subset \mathbb {R}^n\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Ω</mi> <mo>⊂</mo> <msup> <mrow> <mi mathvariant="double-struck">R</mi> </mrow> <mi>n</mi> </msup> </mrow> </math></EquationSource> </InlineEquation> (<InlineEquation ID="IEq2"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq2.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(n\ge 1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>≥</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq3"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq3.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="45" /> </InlineMediaObject> <EquationSource Format="TEX">\(R&gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>R</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>), <InlineEquation ID="IEq4"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq4.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="96" /> </InlineMediaObject> <EquationSource Format="TEX">\(\chi ,\gamma ,\lambda ,\mu &gt;0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>χ</mi> <mo>,</mo> <mi>γ</mi> <mo>,</mo> <mi>λ</mi> <mo>,</mo> <mi>μ</mi> <mo>&gt;</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq5"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq5.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="74" /> </InlineMediaObject> <EquationSource Format="TEX">\(0&lt;\alpha \le 1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>0</mn> <mo>&lt;</mo> <mi>α</mi> <mo>≤</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq6"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq6.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(k&gt;1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>&gt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>. It is proved that the following results: If <InlineEquation ID="IEq7"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq7.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(n=1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq8"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq8.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="74" /> </InlineMediaObject> <EquationSource Format="TEX">\(\gamma \in \left( \frac{\alpha }{2},1\right] \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>γ</mi> <mo>∈</mo> <mfenced close="]" open="("> <mfrac> <mi>α</mi> <mn>2</mn> </mfrac> <mo>,</mo> <mn>1</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq9"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq6.gif" Format="GIF" Height="14" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(k&gt;1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>&gt;</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq10"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq10.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="67" /> </InlineMediaObject> <EquationSource Format="TEX">\(\alpha \in (0,1]\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>α</mi> <mo>∈</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation>, it is proved that model (<InternalRef RefID="Equ1">0.1</InternalRef>) possesses a globally bounded classical solution. If <InlineEquation ID="IEq11"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq11.gif" Format="GIF" Height="15" Rendition="HTML" Resolution="72" Type="Linedraw" Width="43" /> </InlineMediaObject> <EquationSource Format="TEX">\(n\ge 2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>n</mi> <mo>≥</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq12"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq12.gif" Format="GIF" Height="19" Rendition="HTML" Resolution="72" Type="Linedraw" Width="67" /> </InlineMediaObject> <EquationSource Format="TEX">\(\gamma \in (0,1]\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>γ</mi> <mo>∈</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo stretchy="false">]</mo> </mrow> </math></EquationSource> </InlineEquation>, <InlineEquation ID="IEq13"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq13.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="174" /> </InlineMediaObject> <EquationSource Format="TEX">\(\alpha \in \left( \max \left\{ 0,1-\frac{k}{n}\right\} ,1\right) \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>α</mi> <mo>∈</mo> <mfenced close=")" open="("> <mo movablelimits="true">max</mo> <mfenced close="}" open="{"> <mn>0</mn> <mo>,</mo> <mn>1</mn> <mo>-</mo> <mfrac> <mi>k</mi> <mi>n</mi> </mfrac> </mfenced> <mo>,</mo> <mn>1</mn> </mfenced> </mrow> </math></EquationSource> </InlineEquation> and <InlineEquation ID="IEq14"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq14.gif" Format="GIF" Height="23" Rendition="HTML" Resolution="72" Type="Linedraw" Width="58" /> </InlineMediaObject> <EquationSource Format="TEX">\(k&gt;\frac{3n}{2+n}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>k</mi> <mo>&gt;</mo> <mfrac> <mrow> <mn>3</mn> <mi>n</mi> </mrow> <mrow> <mn>2</mn> <mo>+</mo> <mi>n</mi> </mrow> </mfrac> </mrow> </math></EquationSource> </InlineEquation>, it is shown that model (<InternalRef RefID="Equ1">0.1</InternalRef>) has a global classical solution. Especially, for <InlineEquation ID="IEq15"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq15.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="42" /> </InlineMediaObject> <EquationSource Format="TEX">\(\gamma =1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>γ</mi> <mo>=</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation>, the solution is globally bounded when <InlineEquation ID="IEq16"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq16.gif" Format="GIF" Height="26" Rendition="HTML" Resolution="72" Type="Linedraw" Width="48" /> </InlineMediaObject> <EquationSource Format="TEX">\(\lambda &gt;\frac{\chi ^2}{4}\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>λ</mi> <mo>&gt;</mo> <mfrac> <msup> <mi>χ</mi> <mn>2</mn> </msup> <mn>4</mn> </mfrac> </mrow> </math></EquationSource> </InlineEquation> with <InlineEquation ID="IEq17"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq17.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="74" /> </InlineMediaObject> <EquationSource Format="TEX">\(0&lt;\chi \le 2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>0</mn> <mo>&lt;</mo> <mi>χ</mi> <mo>≤</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation> or <InlineEquation ID="IEq18"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq18.gif" Format="GIF" Height="17" Rendition="HTML" Resolution="72" Type="Linedraw" Width="74" /> </InlineMediaObject> <EquationSource Format="TEX">\(\lambda &gt;\chi -1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>λ</mi> <mo>&gt;</mo> <mi>χ</mi> <mo>-</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> with <InlineEquation ID="IEq19"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq19.gif" Format="GIF" Height="16" Rendition="HTML" Resolution="72" Type="Linedraw" Width="44" /> </InlineMediaObject> <EquationSource Format="TEX">\(\chi &gt;2\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>χ</mi> <mo>&gt;</mo> <mn>2</mn> </mrow> </math></EquationSource> </InlineEquation>, and which exponentially converges to <InlineEquation ID="IEq20"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq20.gif" Format="GIF" Height="45" Rendition="HTML" Resolution="72" Type="Linedraw" Width="140" /> </InlineMediaObject> <EquationSource Format="TEX">\(\left( \left( \frac{\lambda }{\mu }\right) ^{\frac{1}{k-1}}, \left( \frac{\lambda }{\mu }\right) ^{\frac{\alpha }{k-1}}\right) \)</EquationSource> <EquationSource Format="MATHML"><math> <mfenced close=")" open="("> <msup> <mfenced close=")" open="("> <mfrac> <mi>λ</mi> <mi>μ</mi> </mfrac> </mfenced> <mfrac> <mn>1</mn> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </mfrac> </msup> <mo>,</mo> <msup> <mfenced close=")" open="("> <mfrac> <mi>λ</mi> <mi>μ</mi> </mfrac> </mfenced> <mfrac> <mi>α</mi> <mrow> <mi>k</mi> <mo>-</mo> <mn>1</mn> </mrow> </mfrac> </msup> </mfenced> </math></EquationSource> </InlineEquation> as <InlineEquation ID="IEq21"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq21.gif" Format="GIF" Height="13" Rendition="HTML" Resolution="72" Type="Linedraw" Width="54" /> </InlineMediaObject> <EquationSource Format="TEX">\(t\rightarrow \infty \)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>t</mi> <mo stretchy="false">→</mo> <mi>∞</mi> </mrow> </math></EquationSource> </InlineEquation> with <InlineEquation ID="IEq22"> <InlineMediaObject> <ImageObject Color="BlackWhite" FileRef="30_2025_1060_Article_IEq22.gif" Format="GIF" Height="12" Rendition="HTML" Resolution="72" Type="Linedraw" Width="15" /> </InlineMediaObject> <EquationSource Format="TEX">\(\mu \)</EquationSource> <EquationSource Format="MATHML"><math> <mi>μ</mi> </math></EquationSource> </InlineEquation> suitably large.</p>

错误:搜索内容不能为空,请输入英文关键词
错误:关键词超出字数限制,请精简
高级检索

Global existence, boundedness and large time behavior for a chemotaxis model with singular sensitivity and nonlinear signal production

  • Jing Zhang,
  • Chunlai Mu,
  • Xinyu Tu

摘要

This paper deals with the following parabolic-elliptic chemotaxis system with singular sensitivity and nonlinear signal production, 0.1 \(\begin{aligned} \left\{ \begin{array}{llll} u_t=\Delta u-\chi \nabla \cdot (\frac{u}{v^\gamma }\nabla v)+\lambda u-\mu u^k,\quad & x\in \Omega ,\quad t>0,\\ 0=\Delta v-v+u^\alpha ,\quad & x\in \Omega ,\quad t>0,\\ \end{array} \right. \end{aligned}\) u t = Δ u - χ · ( u v γ v ) + λ u - μ u k , x Ω , t > 0 , 0 = Δ v - v + u α , x Ω , t > 0 , under homogeneous Neumann boundary conditions and suitable initial value conditions where \(\Omega \subset \mathbb {R}^n\) Ω R n ( \(n\ge 1\) n 1 , \(R>0\) R > 0 ), \(\chi ,\gamma ,\lambda ,\mu >0\) χ , γ , λ , μ > 0 , \(0<\alpha \le 1\) 0 < α 1 and \(k>1\) k > 1 . It is proved that the following results: If \(n=1\) n = 1 , \(\gamma \in \left( \frac{\alpha }{2},1\right] \) γ α 2 , 1 , \(k>1\) k > 1 and \(\alpha \in (0,1]\) α ( 0 , 1 ] , it is proved that model (0.1) possesses a globally bounded classical solution. If \(n\ge 2\) n 2 , \(\gamma \in (0,1]\) γ ( 0 , 1 ] , \(\alpha \in \left( \max \left\{ 0,1-\frac{k}{n}\right\} ,1\right) \) α max 0 , 1 - k n , 1 and \(k>\frac{3n}{2+n}\) k > 3 n 2 + n , it is shown that model (0.1) has a global classical solution. Especially, for \(\gamma =1\) γ = 1 , the solution is globally bounded when \(\lambda >\frac{\chi ^2}{4}\) λ > χ 2 4 with \(0<\chi \le 2\) 0 < χ 2 or \(\lambda >\chi -1\) λ > χ - 1 with \(\chi >2\) χ > 2 , and which exponentially converges to \(\left( \left( \frac{\lambda }{\mu }\right) ^{\frac{1}{k-1}}, \left( \frac{\lambda }{\mu }\right) ^{\frac{\alpha }{k-1}}\right) \) λ μ 1 k - 1 , λ μ α k - 1 as \(t\rightarrow \infty \) t with \(\mu \) μ suitably large.