Double thresholds for blowup and global existence of the solution to a system of parabolic equations

Xiaowei An , Xianfa Song

Electronic Research Archive ›› 2026, Vol. 34 ›› Issue (1) : 606 -626.

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Electronic Research Archive ›› 2026, Vol. 34 ›› Issue (1) :606 -626. DOI: 10.3934/era.2026028
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Double thresholds for blowup and global existence of the solution to a system of parabolic equations
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Abstract

We considered the following parabolic system:

$\left\{\begin{array}{l} u_{t}=d_{1} \Delta u-a(x) \cdot \nabla u+f(u, v), \quad x \in \Omega, t>0, \\ v_{t}=d_{2} \Delta v-b(x) \cdot \nabla v+g(u, v), \quad x \in \Omega, t>0, \\ u(x, 0)=u_{0}(x), \quad v(x, 0)=v_{0}(x), \quad x \in \Omega, \end{array}\right.$
subject to Dirichlet (or Neumann) boundary conditions. Here $\Omega \subset \mathbb{R}^{N}(N \geq 1)$ is a bounded smooth domain. In addition to some results on blowup and global existence of the solution, we found some more interesting results as follows: (1) There exists double thresholds for blowup and global existence of the solution. Under certain conditions, if $f(u, v)=f_{1}(v) g_{1}(u) \text { and } g(u, v)=f_{2}(v) g_{2}(u)$, then the first watershed is
$\int_{c_{1}}^{+\infty} \frac{d u}{g_{1}(u)}=+\infty \quad \text { and } \quad \int_{c_{2}}^{+\infty} \frac{d v}{f_{2}(v)}=+\infty$
and the second watershed is
$\int_{\tilde{c}_{1}}^{+\infty} \frac{d U}{\tilde{f}\left(\tilde{F}^{-1}(K \tilde{G}(U))\right)}=+\infty \quad \text { and } \quad \int_{\tilde{c}_{2}}^{+\infty} \frac{d V}{\tilde{g}\left(\tilde{G}^{-1}\left(\frac{1}{\epsilon} \tilde{F}(V)\right)\right)}=+\infty .$
Here $\tilde{f}, \tilde{g}, \tilde{F} \text { and } \tilde{G}$ will be defined in Section 2.2. (2) If there exist nonnegative smooth functions h(u), l(v) and H(s) such that
$f(u, v) h^{\prime}(u) l(v)+g(u, v) h(u) l^{\prime}(v)=H[h(u) l(v)] \geq 0,$
then the watershed for blowup in finite time and global existence of the solution is
$\int_{0}^{+\infty} \frac{d s}{H(s)}=+\infty$

Keywords

system of parabolic equations / global existence / blowup / double thresholds

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Xiaowei An, Xianfa Song. Double thresholds for blowup and global existence of the solution to a system of parabolic equations. Electronic Research Archive, 2026, 34 (1) : 606-626 DOI:10.3934/era.2026028

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