Integer Topological Defects Reveal Anti-Symmetric Forces in Active Nematics
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arXiv
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| Main Authors: | , , , , , , , |
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| Format: | Preprint |
| Published: |
2024
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| _version_ | 1866912023893245952 |
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| author | Zhao, Zihui Yao, Yisong Li, He Zhao, Yongfeng Wang, Yujia Zhang, Hepeng Chat'e, Hugues Sano, Masaki |
| author_facet | Zhao, Zihui Yao, Yisong Li, He Zhao, Yongfeng Wang, Yujia Zhang, Hepeng Chat'e, Hugues Sano, Masaki |
| contents | Cell layers are often categorized as contractile or extensile active nematics but recent experiments on neural progenitor cells with induced $+1$ topological defects challenge this classification. In a bottom-up approach, we first study a relevant particle-level model and then analyze a continuous theory derived from it. We show that both model and theory account qualitatively for the main experimental result, i.e. accumulation of cells at the core of any type of +1 defect. We argue that cell accumulation is essentially due to two generally ignored 'effective active forces'.
We finally discuss the relevance and consequences of our findings in the context of other cellular active nematics experiments and previously proposed theories. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15431 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Integer Topological Defects Reveal Anti-Symmetric Forces in Active Nematics Zhao, Zihui Yao, Yisong Li, He Zhao, Yongfeng Wang, Yujia Zhang, Hepeng Chat'e, Hugues Sano, Masaki Soft Condensed Matter Statistical Mechanics Biological Physics Cell layers are often categorized as contractile or extensile active nematics but recent experiments on neural progenitor cells with induced $+1$ topological defects challenge this classification. In a bottom-up approach, we first study a relevant particle-level model and then analyze a continuous theory derived from it. We show that both model and theory account qualitatively for the main experimental result, i.e. accumulation of cells at the core of any type of +1 defect. We argue that cell accumulation is essentially due to two generally ignored 'effective active forces'. We finally discuss the relevance and consequences of our findings in the context of other cellular active nematics experiments and previously proposed theories. |
| title | Integer Topological Defects Reveal Anti-Symmetric Forces in Active Nematics |
| topic | Soft Condensed Matter Statistical Mechanics Biological Physics |
| url | https://arxiv.org/abs/2408.15431 |