Phase separation in a mixture of proliferating and motile active matter
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arXiv
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| Main Authors: | , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866916786783387648 |
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| author | Hupe, Lukas Materska, Joanna M. Zwicker, David Golestanian, Ramin Waclaw, Bartlomiej Bittihn, Philip |
| author_facet | Hupe, Lukas Materska, Joanna M. Zwicker, David Golestanian, Ramin Waclaw, Bartlomiej Bittihn, Philip |
| contents | Proliferation and motility are ubiquitous drivers of activity in biological systems. Here, we study a dense binary mixture of motile and proliferating particles with exclusively repulsive interactions, where homeostasis in the proliferating subpopulation is maintained by pressure-induced removal. Using computer simulations, we show that phase separation emerges naturally in this system at high density and weak enough self-propulsion. We show that condensation is caused by interactions between motile particles induced by the growing phase, and recapitulate this behavior in an effective model of only motile particles with attractive interactions. Our results establish a new type of phase transition and pave a way to reinterpret the physics of dense cellular populations, such as bacterial colonies or tumors, as systems of mixed active matter. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_05288 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Phase separation in a mixture of proliferating and motile active matter Hupe, Lukas Materska, Joanna M. Zwicker, David Golestanian, Ramin Waclaw, Bartlomiej Bittihn, Philip Soft Condensed Matter Statistical Mechanics Biological Physics Proliferation and motility are ubiquitous drivers of activity in biological systems. Here, we study a dense binary mixture of motile and proliferating particles with exclusively repulsive interactions, where homeostasis in the proliferating subpopulation is maintained by pressure-induced removal. Using computer simulations, we show that phase separation emerges naturally in this system at high density and weak enough self-propulsion. We show that condensation is caused by interactions between motile particles induced by the growing phase, and recapitulate this behavior in an effective model of only motile particles with attractive interactions. Our results establish a new type of phase transition and pave a way to reinterpret the physics of dense cellular populations, such as bacterial colonies or tumors, as systems of mixed active matter. |
| title | Phase separation in a mixture of proliferating and motile active matter |
| topic | Soft Condensed Matter Statistical Mechanics Biological Physics |
| url | https://arxiv.org/abs/2506.05288 |