Self-alignment and anti-self-alignment suppress motility-induced phase separation in active systems
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| Main Authors: | , , , |
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| Format: | Preprint |
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2025
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| _version_ | 1866913780454129664 |
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| author | Musacchio, Marco Antonov, Alexander P. Löwen, Hartmut Caprini, Lorenzo |
| author_facet | Musacchio, Marco Antonov, Alexander P. Löwen, Hartmut Caprini, Lorenzo |
| contents | In this article, we investigate the impact of self-alignment and anti-self-alignment on collective phenomena in dense active matter. These mechanisms correspond to effective torques that align or anti-align a particles orientation with its velocity, as observed in active granular systems. In the context of motility-induced phase separation (MIPS) - a non-equilibrium coexistence between a dense clustered phase and a dilute homogeneous phase - both self- and anti-self-alignment are found to suppress clustering. Specifically, increasing self-alignment strength first leads to flocking within the dense cluster, and eventually to the emergence of a homogeneous flocking phase. In contrast, anti-self-alignment induces a freezing phenomenon, progressively reducing particle speed until MIPS is suppressed and a homogeneous phase is recovered. These results are supported by scaling arguments and are amenable to experimental verification in high-density active granular systems exhibiting self- or anti-self-alignment. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2504_04644 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Self-alignment and anti-self-alignment suppress motility-induced phase separation in active systems Musacchio, Marco Antonov, Alexander P. Löwen, Hartmut Caprini, Lorenzo Soft Condensed Matter Statistical Mechanics In this article, we investigate the impact of self-alignment and anti-self-alignment on collective phenomena in dense active matter. These mechanisms correspond to effective torques that align or anti-align a particles orientation with its velocity, as observed in active granular systems. In the context of motility-induced phase separation (MIPS) - a non-equilibrium coexistence between a dense clustered phase and a dilute homogeneous phase - both self- and anti-self-alignment are found to suppress clustering. Specifically, increasing self-alignment strength first leads to flocking within the dense cluster, and eventually to the emergence of a homogeneous flocking phase. In contrast, anti-self-alignment induces a freezing phenomenon, progressively reducing particle speed until MIPS is suppressed and a homogeneous phase is recovered. These results are supported by scaling arguments and are amenable to experimental verification in high-density active granular systems exhibiting self- or anti-self-alignment. |
| title | Self-alignment and anti-self-alignment suppress motility-induced phase separation in active systems |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2504.04644 |