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

Source: [Coarsening Kinetics in Active Model B+: Macroscale and Microscale Phase Separation](<https://www.sota2.com/research/paper/68fa4b881e209131ce946a8d>)

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Data updated: 2025-10-25T08:23:05.142Z

Authors: Pradeep Kumar Yadav, Shradha Mishra, Sanjay Puri

Published: 2025-06-17T14:04:56.000Z

## 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 $\\lambda$) and rotational current (of strength $\\xi$). We find that the presence of rotational current $(\\xi \\neq 0)$ significantly affects growth kinetics. Depending on the parameter values, AMB+ exhibits either {\\it macroscale phase separation} (MPS) or {\\it microscale phase separation} ($\\mu$PS). We present detailed results for the kinetics of MPS and $\\mu$PS in AMB+ with critical composition.

## Recorded benchmark results

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2506.14548>)

[PDF](<https://arxiv.org/pdf/2506.14548.pdf>)