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| Main Authors: | , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2504.20352 |
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| _version_ | 1866918152770682880 |
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| author | Sun, Aoran Wei, Da Zhang, Yiyu Ye, Fangfu Podgornik, Rudolf |
| author_facet | Sun, Aoran Wei, Da Zhang, Yiyu Ye, Fangfu Podgornik, Rudolf |
| contents | We study an active Brownian run-and-tumble particle (ABRTP) model, that consists of an active Brownian run state during which the active velocity of the particle diffuses on the unit circle, and a tumble state during which the active velocity is zero, both with exponentially distributed time. Additionally we add a harmonic trap as an external potential. In the appropriate limits the ABRTP model reduces either to the active Brownian particle model, or the run-and-tumble particle model. Using the method of direct integration the equation of motion, pioneered by Kac, we obtain exact moments for the Laplace transform of the time dependent ABRTP, in the presence or absence of a harmonic trap. In addition we estimate the distribution moments with the help of the Chebyshev polynomials. Our results are in excellent agreement with the experiments. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2504_20352 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Moment analysis of two-dimensional active Brownian run-and-tumble particles Sun, Aoran Wei, Da Zhang, Yiyu Ye, Fangfu Podgornik, Rudolf Statistical Mechanics We study an active Brownian run-and-tumble particle (ABRTP) model, that consists of an active Brownian run state during which the active velocity of the particle diffuses on the unit circle, and a tumble state during which the active velocity is zero, both with exponentially distributed time. Additionally we add a harmonic trap as an external potential. In the appropriate limits the ABRTP model reduces either to the active Brownian particle model, or the run-and-tumble particle model. Using the method of direct integration the equation of motion, pioneered by Kac, we obtain exact moments for the Laplace transform of the time dependent ABRTP, in the presence or absence of a harmonic trap. In addition we estimate the distribution moments with the help of the Chebyshev polynomials. Our results are in excellent agreement with the experiments. |
| title | Moment analysis of two-dimensional active Brownian run-and-tumble particles |
| topic | Statistical Mechanics |
| url | https://arxiv.org/abs/2504.20352 |