Memory-induced active particle ratchets: Mean currents and large deviations
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arXiv
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| Format: | Preprint |
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2026
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| _version_ | 1866912928581550080 |
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| author | Pamulaparthy, Venkata D. Harris, Rosemary J. |
| author_facet | Pamulaparthy, Venkata D. Harris, Rosemary J. |
| contents | We analyse a continuous-time random walk model with stochastic reversals of direction. There is no external potential but the reorientation mechanism generates a non-zero current from asymmetry in the forward and backward waiting-time distributions (even when they have the same mean); the system can therefore can be considered as a type of active particle ratchet. We derive an explicit expression for the mean ratchet current with exponentially distributed reorientation times and also develop a general renewal-theory framework to obtain the full large deviations, using this to comment on the possibility of dynamical phase transitions. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2602_23327 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Memory-induced active particle ratchets: Mean currents and large deviations Pamulaparthy, Venkata D. Harris, Rosemary J. Statistical Mechanics We analyse a continuous-time random walk model with stochastic reversals of direction. There is no external potential but the reorientation mechanism generates a non-zero current from asymmetry in the forward and backward waiting-time distributions (even when they have the same mean); the system can therefore can be considered as a type of active particle ratchet. We derive an explicit expression for the mean ratchet current with exponentially distributed reorientation times and also develop a general renewal-theory framework to obtain the full large deviations, using this to comment on the possibility of dynamical phase transitions. |
| title | Memory-induced active particle ratchets: Mean currents and large deviations |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2602.23327 |