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On an attraction-repulsion chemotaxis system with a logistic source. (English) Zbl 1336.35338

Summary: This paper is devoted to the attraction-repulsion chemotaxis system with a logistic source: \[ \begin{cases} u_t= \Delta u- \chi \nabla (u \nabla v)+ \mu \nabla (u \nabla w) + \mathcal{R}(u), \; x\in \Omega,\;t>0,\\ v_t= \Delta v- \alpha_1 v + \beta_1 u, \; x\in \Omega,\;t>0\\ w_t=\Delta w-\alpha_2 w + \beta_2 u, \; x\in \Omega,\;t>0 \end{cases} \]
where \(\Omega \subset \mathbb {R}^N(N\geqslant 1)\) is a bounded domain with smooth boundary and \(\mathcal {R}(s)\leqslant a-bs^\tau \). For the case \(\varrho =0\), we show that when the repulsion prevails over the attraction in the sense that \(\mu \beta _2-\chi \beta _1>0\), there exist global bounded classical solutions for any logistic damping \(\tau \geqslant 1\). When the attraction dominates the repulsion in the sense that \(\mu \beta _2-\chi \beta _1<0\), the classical solutions are still global and bounded provided that the logistic damping is strong. For the case \(\varrho >0\), we will investigate the similar problem for \(N=1\) and \(N=2\). We will also study the regularity of stationary solutions.

MSC:

35Q92 PDEs in connection with biology, chemistry and other natural sciences
92C17 Cell movement (chemotaxis, etc.)
35B41 Attractors
35B65 Smoothness and regularity of solutions to PDEs
35A01 Existence problems for PDEs: global existence, local existence, non-existence
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