@article{53331,
abstract = {{In a ball $\Omega \subset \mathbb {R}^{n}$ with $n\ge 2$, the chemotaxis system
\[ \left\{ \begin{array}{@{}l} u_t = \nabla \cdot \big( D(u)\nabla u\big) + \nabla\cdot \big(\dfrac{u}{v} \nabla v\big), \\ 0=\Delta v - uv \end{array} \right. \]is considered along with no-flux boundary conditions for $u$ and with prescribed constant positive Dirichlet boundary data for $v$. It is shown that if $D\in C^{3}([0,\infty ))$ is such that $0< D(\xi ) \le {K_D} (\xi +1)^{-\alpha }$ for all $\xi >0$ with some ${K_D}>0$ and $\alpha >0$, then for all initial data from a considerably large set of radial functions on $\Omega$, the corresponding initial-boundary value problem admits a solution blowing up in finite time.}},
author = {{Wang, Yulan and Winkler, Michael}},
issn = {{0308-2105}},
journal = {{Proceedings of the Royal Society of Edinburgh: Section A Mathematics}},
keywords = {{General Mathematics}},
number = {{4}},
pages = {{1150--1166}},
publisher = {{Cambridge University Press (CUP)}},
title = {{{Finite-time blow-up in a repulsive chemotaxis-consumption system}}},
doi = {{10.1017/prm.2022.39}},
volume = {{153}},
year = {{2022}},
}
@article{63274,
abstract = {{In a ball $\Omega \subset \mathbb {R}^{n}$ with $n\ge 2$, the chemotaxis system
\[ \left\{ \begin{array}{@{}l} u_t = \nabla \cdot \big( D(u)\nabla u\big) + \nabla\cdot \big(\dfrac{u}{v} \nabla v\big), \\ 0=\Delta v - uv \end{array} \right. \]is considered along with no-flux boundary conditions for $u$ and with prescribed constant positive Dirichlet boundary data for $v$. It is shown that if $D\in C^{3}([0,\infty ))$ is such that $0< D(\xi ) \le {K_D} (\xi +1)^{-\alpha }$ for all $\xi >0$ with some ${K_D}>0$ and $\alpha >0$, then for all initial data from a considerably large set of radial functions on $\Omega$, the corresponding initial-boundary value problem admits a solution blowing up in finite time.}},
author = {{Wang, Yulan and Winkler, Michael}},
issn = {{0308-2105}},
journal = {{Proceedings of the Royal Society of Edinburgh: Section A Mathematics}},
number = {{4}},
pages = {{1150--1166}},
publisher = {{Cambridge University Press (CUP)}},
title = {{{Finite-time blow-up in a repulsive chemotaxis-consumption system}}},
doi = {{10.1017/prm.2022.39}},
volume = {{153}},
year = {{2022}},
}
@article{63369,
abstract = {{The paper studies large time behaviour of solutions to the Keller–Segel system with quadratic degradation in a liquid environment, as given byunder Neumann boundary conditions in a bounded domain Ω ⊂ ℝn, where n ≥ 1 is arbitrary. It is shown that whenever U : Ω × (0,∞) → ℝn is a bounded and sufficiently regular solenoidal vector field any non-trivial global bounded solution of (⋆) approaches the trivial equilibrium at a rate that, with respect to the norm in either of the spaces L1(Ω) and L∞(Ω), can be controlled from above and below by appropriate multiples of 1/(t + 1). This underlines that, even up to this quantitative level of accuracy, the large time behaviour in (⋆) is essentially independent not only of the particular fluid flow, but also of any effect originating from chemotactic cross-diffusion. The latter is in contrast to the corresponding Cauchy problem, for which known results show that in the n = 2 case the presence of chemotaxis can significantly enhance biomixing by reducing the respective spatial L1 norms of solutions.}},
author = {{Cao, Xinru and Winkler, Michael}},
issn = {{0308-2105}},
journal = {{Proceedings of the Royal Society of Edinburgh: Section A Mathematics}},
number = {{5}},
pages = {{939--955}},
publisher = {{Cambridge University Press (CUP)}},
title = {{{Sharp decay estimates in a bioconvection model with quadratic degradation in bounded domains}}},
doi = {{10.1017/s0308210518000057}},
volume = {{148}},
year = {{2018}},
}