Effective diffusion of a tracer in active bath: a path-integral approach
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arXiv
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| Auteurs principaux: | , |
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| Format: | Preprint |
| Publié: |
2023
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| _version_ | 1866929399875502080 |
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| author | Feng, Mengkai Hou, Zhonghuai |
| author_facet | Feng, Mengkai Hou, Zhonghuai |
| contents | We investigate the effective diffusion of a tracer immersed in an active particle bath consisting of self-propelled particles. Utilising the Dean's method developed for the equilibrium bath and extending it to the nonequilibrium situation, we derive a generalized Langevin equation (GLE) for the tracer particle. The complex interactions between the tracer and bath particles are shown as a memory kernel term and two colored noise terms. To obtain the effective diffusivity of the tracer, we use path integral technique to calculate all necessary correlation functions. Calculations show the effective diffusion decreases with the persistent time of active force, and has rich behavior with number density of bath particles, depending on different activity. All theoretical results regarding the dependence of such diffusivity on bath parameters have been confirmed by direct computer simulation. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_10325 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Effective diffusion of a tracer in active bath: a path-integral approach Feng, Mengkai Hou, Zhonghuai Soft Condensed Matter We investigate the effective diffusion of a tracer immersed in an active particle bath consisting of self-propelled particles. Utilising the Dean's method developed for the equilibrium bath and extending it to the nonequilibrium situation, we derive a generalized Langevin equation (GLE) for the tracer particle. The complex interactions between the tracer and bath particles are shown as a memory kernel term and two colored noise terms. To obtain the effective diffusivity of the tracer, we use path integral technique to calculate all necessary correlation functions. Calculations show the effective diffusion decreases with the persistent time of active force, and has rich behavior with number density of bath particles, depending on different activity. All theoretical results regarding the dependence of such diffusivity on bath parameters have been confirmed by direct computer simulation. |
| title | Effective diffusion of a tracer in active bath: a path-integral approach |
| topic | Soft Condensed Matter |
| url | https://arxiv.org/abs/2311.10325 |