Coarsening Kinetics in Active Model B+: Macroscale and Microscale Phase Separation
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| Format: | Preprint |
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2025
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| _version_ | 1866909754415120384 |
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| author | Yadav, Pradeep Kumar Mishra, Shradha Puri, Sanjay |
| author_facet | Yadav, Pradeep Kumar Mishra, Shradha Puri, Sanjay |
| contents | We perform a comprehensive numerical investigation of the coarsening kinetics of active Brownian particles modeled by the {\it Active Model B+} (AMB+). This model was introduced by Tjhung et al. [Phys. Rev. X {\bf 8}, 031080 (2018)] and is a generalization of Model B for a conserved order parameter, with two additional activity terms. These terms correspond to rotation-free current (of strength $λ$) and rotational current (of strength $ξ$). We find that the presence of rotational current $(ξ\neq 0)$ significantly affects growth kinetics. Depending on the parameter values, AMB+ exhibits either {\it macroscale phase separation} (MPS) or {\it microscale phase separation} ($μ$PS). We present detailed results for the kinetics of MPS and $μ$PS in AMB+ with critical composition. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_14548 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Coarsening Kinetics in Active Model B+: Macroscale and Microscale Phase Separation Yadav, Pradeep Kumar Mishra, Shradha Puri, Sanjay Soft Condensed Matter We perform a comprehensive numerical investigation of the coarsening kinetics of active Brownian particles modeled by the {\it Active Model B+} (AMB+). This model was introduced by Tjhung et al. [Phys. Rev. X {\bf 8}, 031080 (2018)] and is a generalization of Model B for a conserved order parameter, with two additional activity terms. These terms correspond to rotation-free current (of strength $λ$) and rotational current (of strength $ξ$). We find that the presence of rotational current $(ξ\neq 0)$ significantly affects growth kinetics. Depending on the parameter values, AMB+ exhibits either {\it macroscale phase separation} (MPS) or {\it microscale phase separation} ($μ$PS). We present detailed results for the kinetics of MPS and $μ$PS in AMB+ with critical composition. |
| title | Coarsening Kinetics in Active Model B+: Macroscale and Microscale Phase Separation |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2506.14548 |