Coarsening Kinetics in Active Model B+: Macroscale and Microscale Phase Separation

2025/06/17 by Yadav, Pradeep Kumar, Mishra, Shradha, Puri, Sanjay · 2 citations
#FOS: Physical sciences #Soft Condensed Matter (cond-mat.soft)

paper · doi:10.48550/arxiv.2506.14548

Abstract

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≠ 0) significantly affects growth kinetics. Depending on the parameter values, AMB+ exhibits either \it macroscale phase separation (MPS) or \it microscale phase separation (μPS). We present detailed results for the kinetics of MPS and μPS in AMB+ with critical composition.

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• Statistics and morphologies of stable droplets in scalar active fluids
• Unconventional Phase Separation and Fractal Interfaces of Colloids in Active Liquids

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