26 research outputs found

    Boundedness in a fully parabolic chemotaxis system with nonlinear diffusion and sensitivity, and logistic source

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    In this paper we study the zero-flux chemotaxis-system \begin{equation*} \begin{cases} u_{ t}=\nabla \cdot ((u+1)^{m-1} \nabla u-(u+1)^\alpha \chi(v)\nabla v) + ku-\mu u^2 & x\in \Omega, t>0, \\ v_{t} = \Delta v-vu & x\in \Omega, t>0,\\ \end{cases} \end{equation*} Ω\Omega being a bounded and smooth domain of Rn\mathbb{R}^n, n≥1n\geq 1, and where m,k∈Rm,k \in \mathbb{R}, μ>0\mu>0 and α<m+12\alpha < \frac{m+1}{2}. For any v≥0v\geq 0 the chemotactic sensitivity function is assumed to behave as the prototype χ(v)=χ0(1+av)2\chi(v) = \frac{\chi_0}{(1+av)^2}, with a≥0a\geq 0 and χ0>0\chi_0>0. We prove that for nonnegative and sufficiently regular initial data u(x,0)u(x,0) and v(x,0),v(x,0), the corresponding initial-boundary value problem admits a global bounded classical solution provided μ\mu is large enough
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