Cooling mechanism controls motility-induced phase separation in inertial active liquids
Fuente:
arXiv
Gespeichert in:
| Hauptverfasser: | , , , , , , |
|---|---|
| Format: | Preprint |
| Veröffentlicht: |
2025
|
| Schlagworte: | |
| Online-Zugang: | |
| Tags: |
Tag hinzufügen
Keine Tags, Fügen Sie den ersten Tag hinzu!
|
| _version_ | 1866909970852741120 |
|---|---|
| author | Mayo, Manuel Caprini, Lorenzo de Soria, María Isabel García Marconi, Umberto Marini Bettolo Maynar, Pablo Pizzoli, Luca Puglisi, Andrea |
| author_facet | Mayo, Manuel Caprini, Lorenzo de Soria, María Isabel García Marconi, Umberto Marini Bettolo Maynar, Pablo Pizzoli, Luca Puglisi, Andrea |
| contents | Motility-induced phase separation (MIPS) is a central collective phenomenon in active matter, theoretically established in the overdamped regime. We discover that the dynamical origin of MIPS is fundamentally altered by inertia, which induces a cooling mechanism absent in overdamped active matter. This conclusion is supported by an active variant of the direct simulation Monte Carlo method and by a kinetic theory for inertial self-propelled hard spheres derived from the microscopic dynamics. In contrast to the overdamped case, both analyses demonstrate that inertial MIPS does not rely on volume exclusion but on a cooling mechanism involving density, polarization, and temperature fields. This mechanism emerges from the competition between activity and a density dependent collision rate, arising from spatial correlations between colliding particles. These findings open a pathway to fundamentally connect inertial active matter with granular physics. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_17443 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Cooling mechanism controls motility-induced phase separation in inertial active liquids Mayo, Manuel Caprini, Lorenzo de Soria, María Isabel García Marconi, Umberto Marini Bettolo Maynar, Pablo Pizzoli, Luca Puglisi, Andrea Soft Condensed Matter Motility-induced phase separation (MIPS) is a central collective phenomenon in active matter, theoretically established in the overdamped regime. We discover that the dynamical origin of MIPS is fundamentally altered by inertia, which induces a cooling mechanism absent in overdamped active matter. This conclusion is supported by an active variant of the direct simulation Monte Carlo method and by a kinetic theory for inertial self-propelled hard spheres derived from the microscopic dynamics. In contrast to the overdamped case, both analyses demonstrate that inertial MIPS does not rely on volume exclusion but on a cooling mechanism involving density, polarization, and temperature fields. This mechanism emerges from the competition between activity and a density dependent collision rate, arising from spatial correlations between colliding particles. These findings open a pathway to fundamentally connect inertial active matter with granular physics. |
| title | Cooling mechanism controls motility-induced phase separation in inertial active liquids |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2512.17443 |