Superdiffusion and antidiffusion in an aligned active suspension
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arXiv
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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866914419656622080 |
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| author | Dadhichi, Lokrshi Prawar Sahoo, Suvendra K. Kumar, K. Vijay Ramaswamy, Sriram |
| author_facet | Dadhichi, Lokrshi Prawar Sahoo, Suvendra K. Kumar, K. Vijay Ramaswamy, Sriram |
| contents | We show theoretically that an imposed uniaxial anisotropy leads to new universality classes for the dynamics of active particles suspended in a viscous fluid. In the homogeneous state, their concentration relaxes superdiffusively, stirred by the long-ranged flows generated by its own fluctuations, as confirmed by our numerical simulations. Increasing activity leads to an anisotropic diffusive instability, and thus an original phase-separation mechanism, driven by the interplay of active stresses with a particle current proportional to the local curvature of the suspension velocity profile. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_00740 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Superdiffusion and antidiffusion in an aligned active suspension Dadhichi, Lokrshi Prawar Sahoo, Suvendra K. Kumar, K. Vijay Ramaswamy, Sriram Soft Condensed Matter Statistical Mechanics We show theoretically that an imposed uniaxial anisotropy leads to new universality classes for the dynamics of active particles suspended in a viscous fluid. In the homogeneous state, their concentration relaxes superdiffusively, stirred by the long-ranged flows generated by its own fluctuations, as confirmed by our numerical simulations. Increasing activity leads to an anisotropic diffusive instability, and thus an original phase-separation mechanism, driven by the interplay of active stresses with a particle current proportional to the local curvature of the suspension velocity profile. |
| title | Superdiffusion and antidiffusion in an aligned active suspension |
| topic | Soft Condensed Matter Statistical Mechanics |
| url | https://arxiv.org/abs/2510.00740 |