<p>This paper investigates a <i>p</i>-Laplace higher-order hyperbolic equation with strong and weak damping terms and a superlinear source: <Equation ID="Equ86"> <EquationSource Format="TEX">\(\begin{aligned} u_{tt}-\Delta _{p}u+\Delta ^{2}u-\Delta u_{t}+|u_{t}|^{m-1}u_{t}=|u|^{q-1}u, \end{aligned}\)</EquationSource> <EquationSource Format="MATHML"><math display="block"> <mrow> <mtable> <mtr> <mtd columnalign="right"> <mrow> <msub> <mi>u</mi> <mrow> <mi mathvariant="italic">tt</mi> </mrow> </msub> <mo>-</mo> <msub> <mi mathvariant="normal">Δ</mi> <mi>p</mi> </msub> <mi>u</mi> <mo>+</mo> <msup> <mi mathvariant="normal">Δ</mi> <mn>2</mn> </msup> <mi>u</mi> <mo>-</mo> <mi mathvariant="normal">Δ</mi> <msub> <mi>u</mi> <mi>t</mi> </msub> <mrow> <mo>+</mo> <mo stretchy="false">|</mo> </mrow> <msub> <mi>u</mi> <mi>t</mi> </msub> <msup> <mrow> <mo stretchy="false">|</mo> </mrow> <mrow> <mi>m</mi> <mo>-</mo> <mn>1</mn> </mrow> </msup> <msub> <mi>u</mi> <mi>t</mi> </msub> <mo>=</mo> <msup> <mrow> <mo stretchy="false">|</mo> <mi>u</mi> <mo stretchy="false">|</mo> </mrow> <mrow> <mi>q</mi> <mo>-</mo> <mn>1</mn> </mrow> </msup> <mi>u</mi> <mo>,</mo> </mrow> </mtd> </mtr> </mtable> </mrow> </math></EquationSource> </Equation>in <InlineEquation ID="IEq1"> <EquationSource Format="TEX">\(\Omega \times (0,T_{\textrm{max}})\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi mathvariant="normal">Ω</mi> <mo>×</mo> <mo stretchy="false">(</mo> <mn>0</mn> <mo>,</mo> <msub> <mi>T</mi> <mtext>max</mtext> </msub> <mo stretchy="false">)</mo> </mrow> </math></EquationSource> </InlineEquation>, subject to null Navier boundary conditions. Here, <InlineEquation ID="IEq2"> <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> is a bounded open domain. By using the Banach contraction mapping principle, we establish the well-posedness of weak solutions. When <InlineEquation ID="IEq3"> <EquationSource Format="TEX">\(q + 1 \le p\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>q</mi> <mo>+</mo> <mn>1</mn> <mo>≤</mo> <mi>p</mi> </mrow> </math></EquationSource> </InlineEquation>, we prove that all the weak solutions remain globally bounded. For <InlineEquation ID="IEq4"> <EquationSource Format="TEX">\(q + 1 &gt; p\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>q</mi> <mo>+</mo> <mn>1</mn> <mo>&gt;</mo> <mi>p</mi> </mrow> </math></EquationSource> </InlineEquation>, within the potential well framework, we derive the global existence of solutions for both critical and subcritical initial energy cases, accompanied by distinct decay estimates for global solutions when <InlineEquation ID="IEq5"> <EquationSource Format="TEX">\(q+1 &gt; p\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>q</mi> <mo>+</mo> <mn>1</mn> <mo>&gt;</mo> <mi>p</mi> </mrow> </math></EquationSource> </InlineEquation>, initial energy <InlineEquation ID="IEq6"> <EquationSource Format="TEX">\(E(0) \le d\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>E</mi> <mo stretchy="false">(</mo> <mn>0</mn> <mo stretchy="false">)</mo> <mo>≤</mo> <mi>d</mi> </mrow> </math></EquationSource> </InlineEquation> and Nehari functional <InlineEquation ID="IEq7"> <EquationSource Format="TEX">\(I(u_0)\ge 0\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mi>I</mi> <mo stretchy="false">(</mo> <msub> <mi>u</mi> <mn>0</mn> </msub> <mo stretchy="false">)</mo> <mo>≥</mo> <mn>0</mn> </mrow> </math></EquationSource> </InlineEquation>. Additionally, under specific exponent conditions (e.g., <InlineEquation ID="IEq8"> <EquationSource Format="TEX">\(2\le m+1&lt; p &lt; q+1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mn>2</mn> <mo>≤</mo> <mi>m</mi> <mo>+</mo> <mn>1</mn> <mo>&lt;</mo> <mi>p</mi> <mo>&lt;</mo> <mi>q</mi> <mo>+</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> for negative initial energy, <InlineEquation ID="IEq9"> <EquationSource Format="TEX">\(\max \{p, m+1\}&lt;q+1\)</EquationSource> <EquationSource Format="MATHML"><math> <mrow> <mo movablelimits="true">max</mo> <mo stretchy="false">{</mo> <mi>p</mi> <mo>,</mo> <mi>m</mi> <mo>+</mo> <mn>1</mn> <mo stretchy="false">}</mo> <mo>&lt;</mo> <mi>q</mi> <mo>+</mo> <mn>1</mn> </mrow> </math></EquationSource> </InlineEquation> for non-negative initial energy), we characterize finite-time blow-up of solutions under both positive and negative initial energy conditions. Using an auxiliary function method, we further demonstrate finite-time blow-up for linear weak damping with subcritical initial energy, and derive the bounds for the blow-up time.</p>

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Well-posedness and singularity of solutions in a p-Laplace higher-order hyperbolic equation

  • Bingchen Liu,
  • Jiaxin Dou

摘要

This paper investigates a p-Laplace higher-order hyperbolic equation with strong and weak damping terms and a superlinear source: \(\begin{aligned} u_{tt}-\Delta _{p}u+\Delta ^{2}u-\Delta u_{t}+|u_{t}|^{m-1}u_{t}=|u|^{q-1}u, \end{aligned}\) u tt - Δ p u + Δ 2 u - Δ u t + | u t | m - 1 u t = | u | q - 1 u , in \(\Omega \times (0,T_{\textrm{max}})\) Ω × ( 0 , T max ) , subject to null Navier boundary conditions. Here, \(\Omega \subset {\mathbb {R}}^n\) Ω R n is a bounded open domain. By using the Banach contraction mapping principle, we establish the well-posedness of weak solutions. When \(q + 1 \le p\) q + 1 p , we prove that all the weak solutions remain globally bounded. For \(q + 1 > p\) q + 1 > p , within the potential well framework, we derive the global existence of solutions for both critical and subcritical initial energy cases, accompanied by distinct decay estimates for global solutions when \(q+1 > p\) q + 1 > p , initial energy \(E(0) \le d\) E ( 0 ) d and Nehari functional \(I(u_0)\ge 0\) I ( u 0 ) 0 . Additionally, under specific exponent conditions (e.g., \(2\le m+1< p < q+1\) 2 m + 1 < p < q + 1 for negative initial energy, \(\max \{p, m+1\}<q+1\) max { p , m + 1 } < q + 1 for non-negative initial energy), we characterize finite-time blow-up of solutions under both positive and negative initial energy conditions. Using an auxiliary function method, we further demonstrate finite-time blow-up for linear weak damping with subcritical initial energy, and derive the bounds for the blow-up time.