Collective dynamics of densely confined active polar disks with self- and mutual alignment
We study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactio...
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| Language: | English |
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2025-07-01
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| Series: | SciPost Physics |
| Online Access: | https://scipost.org/SciPostPhys.19.1.012 |
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| author | Weizhen Tang, Yating Zheng, Amir Shee, Guozheng Lin, Zhangang Han, Pawel Romanczuk, Cristián Huepe |
| author_facet | Weizhen Tang, Yating Zheng, Amir Shee, Guozheng Lin, Zhangang Han, Pawel Romanczuk, Cristián Huepe |
| author_sort | Weizhen Tang, Yating Zheng, Amir Shee, Guozheng Lin, Zhangang Han, Pawel Romanczuk, Cristián Huepe |
| collection | DOAJ |
| description | We study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactions, while also displaying mutual alignment with neighbors due to having its center of rotation located a distance $R$ behind its centroid, so that central contact forces can also introduce torques. The effect of both alignment mechanisms produces a variety of collective states that combine high-frequency localized circular oscillations with low-frequency milling around the center of the arena, in fluid or solid regimes. We consider cases with small/large $R$ values, isotropic/anisotropic disk-substrate damping, smooth/rough arena boundaries, different densities, and multiple systems sizes, showing that the emergent collective states that we identify are robust, generic, and potentially observable in real-world natural or artificial systems. |
| format | Article |
| id | doaj-art-004ee6b31e9a413d994b863d6670e059 |
| institution | Kabale University |
| issn | 2542-4653 |
| language | English |
| publishDate | 2025-07-01 |
| publisher | SciPost |
| record_format | Article |
| series | SciPost Physics |
| spelling | doaj-art-004ee6b31e9a413d994b863d6670e0592025-08-20T03:33:42ZengSciPostSciPost Physics2542-46532025-07-0119101210.21468/SciPostPhys.19.1.012Collective dynamics of densely confined active polar disks with self- and mutual alignmentWeizhen Tang, Yating Zheng, Amir Shee, Guozheng Lin, Zhangang Han, Pawel Romanczuk, Cristián HuepeWe study the emerging collective states in a simple mechanical model of a dense group of self-propelled polar disks with off-centered rotation, confined within a circular arena. Each disk presents self-alignment towards the sum of contact forces acting on it, resulting from disk-substrate interactions, while also displaying mutual alignment with neighbors due to having its center of rotation located a distance $R$ behind its centroid, so that central contact forces can also introduce torques. The effect of both alignment mechanisms produces a variety of collective states that combine high-frequency localized circular oscillations with low-frequency milling around the center of the arena, in fluid or solid regimes. We consider cases with small/large $R$ values, isotropic/anisotropic disk-substrate damping, smooth/rough arena boundaries, different densities, and multiple systems sizes, showing that the emergent collective states that we identify are robust, generic, and potentially observable in real-world natural or artificial systems.https://scipost.org/SciPostPhys.19.1.012 |
| spellingShingle | Weizhen Tang, Yating Zheng, Amir Shee, Guozheng Lin, Zhangang Han, Pawel Romanczuk, Cristián Huepe Collective dynamics of densely confined active polar disks with self- and mutual alignment SciPost Physics |
| title | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| title_full | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| title_fullStr | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| title_full_unstemmed | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| title_short | Collective dynamics of densely confined active polar disks with self- and mutual alignment |
| title_sort | collective dynamics of densely confined active polar disks with self and mutual alignment |
| url | https://scipost.org/SciPostPhys.19.1.012 |
| work_keys_str_mv | AT weizhentangyatingzhengamirsheeguozhenglinzhanganghanpawelromanczukcristianhuepe collectivedynamicsofdenselyconfinedactivepolardiskswithselfandmutualalignment |