Transient Instability and Patterns of Reactivity in Diffusive-Chemotaxis Soil Carbon Dynamics
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| Main Authors: | , , , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866911207493992448 |
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| author | Diele, Fasma Krause, Andrew L. Lacitignola, Deborah Marangi, Carmela Monti, Angela Villar-Sepúlveda, Edgardo |
| author_facet | Diele, Fasma Krause, Andrew L. Lacitignola, Deborah Marangi, Carmela Monti, Angela Villar-Sepúlveda, Edgardo |
| contents | We study pattern formation in a chemotaxis model of bacteria and soil carbon dynamics as an example system where transient dynamics can give rise to pattern formation outside of Turing unstable regimes. We use a detailed analysis of the reactivity of the non-spatial and spatial dynamics, stability analyses, and numerical continuation to uncover detailed aspects of this system's pattern-forming potential. In addition to patterning in Turing unstable parameter regimes, reactivity of the spatial system can itself lead to a range of parameters where a spatially uniform state is asymptotically stable, but exhibits transient growth that can induce pattern formation. We show that this occurs in the bistable region of a subcritical Turing bifurcation. Intriguingly, such bistable regions appear in two spatial dimensions, but not in a one-dimensional domain, suggesting important interplays between geometry, transient growth, and the emergence of multistable patterns. We discuss the implications of our analysis for the bacterial soil organic carbon system, as well as for reaction-transport modeling more generally. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2501_08757 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Transient Instability and Patterns of Reactivity in Diffusive-Chemotaxis Soil Carbon Dynamics Diele, Fasma Krause, Andrew L. Lacitignola, Deborah Marangi, Carmela Monti, Angela Villar-Sepúlveda, Edgardo Numerical Analysis 35B36, 35B32 We study pattern formation in a chemotaxis model of bacteria and soil carbon dynamics as an example system where transient dynamics can give rise to pattern formation outside of Turing unstable regimes. We use a detailed analysis of the reactivity of the non-spatial and spatial dynamics, stability analyses, and numerical continuation to uncover detailed aspects of this system's pattern-forming potential. In addition to patterning in Turing unstable parameter regimes, reactivity of the spatial system can itself lead to a range of parameters where a spatially uniform state is asymptotically stable, but exhibits transient growth that can induce pattern formation. We show that this occurs in the bistable region of a subcritical Turing bifurcation. Intriguingly, such bistable regions appear in two spatial dimensions, but not in a one-dimensional domain, suggesting important interplays between geometry, transient growth, and the emergence of multistable patterns. We discuss the implications of our analysis for the bacterial soil organic carbon system, as well as for reaction-transport modeling more generally. |
| title | Transient Instability and Patterns of Reactivity in Diffusive-Chemotaxis Soil Carbon Dynamics |
| topic | Numerical Analysis 35B36, 35B32 |
| url | https://arxiv.org/abs/2501.08757 |