Optimal mean first-passage time of a run-and-tumble particle in a class of one-dimensional confining potentials
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , , |
|---|---|
| Format: | Preprint |
| Publié: |
2023
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866929285695012864 |
|---|---|
| author | Guéneau, Mathis Majumdar, Satya N. Schehr, Gregory |
| author_facet | Guéneau, Mathis Majumdar, Satya N. Schehr, Gregory |
| contents | We consider a run-and-tumble particle (RTP) in one dimension, subjected to a telegraphic noise with a constant rate $γ$, and in the presence of an external confining potential $V(x) = α|x|^p$ with $p \geq 1$. We compute the mean first-passage time (MFPT) at the origin $τ_γ(x_0)$ for an RTP starting at $x_0$. We obtain a closed form expression for $τ_γ(x_0)$ for all $p \geq 1$, which becomes fully explicit in the case $p=1$, $p=2$ and in the limit $p \to \infty$. For generic $p>1$ we find that there exists an optimal rate $γ_{\rm opt}$ that minimizes the MFPT and we characterize in detail its dependence on $x_0$. We find that $γ_{\rm opt} \propto 1/x_0$ as $x_0 \to 0$, while $γ_{\rm opt}$ converges to a nontrivial constant as $x_0 \to \infty$. In contrast, for $p=1$, there is no finite optimum and $γ_{\rm opt} \to \infty$ in this case. These analytical results are confirmed by our numerical simulations. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2311_06923 |
| institution | arXiv |
| publishDate | 2023 |
| record_format | arxiv |
| spellingShingle | Optimal mean first-passage time of a run-and-tumble particle in a class of one-dimensional confining potentials Guéneau, Mathis Majumdar, Satya N. Schehr, Gregory Statistical Mechanics Soft Condensed Matter We consider a run-and-tumble particle (RTP) in one dimension, subjected to a telegraphic noise with a constant rate $γ$, and in the presence of an external confining potential $V(x) = α|x|^p$ with $p \geq 1$. We compute the mean first-passage time (MFPT) at the origin $τ_γ(x_0)$ for an RTP starting at $x_0$. We obtain a closed form expression for $τ_γ(x_0)$ for all $p \geq 1$, which becomes fully explicit in the case $p=1$, $p=2$ and in the limit $p \to \infty$. For generic $p>1$ we find that there exists an optimal rate $γ_{\rm opt}$ that minimizes the MFPT and we characterize in detail its dependence on $x_0$. We find that $γ_{\rm opt} \propto 1/x_0$ as $x_0 \to 0$, while $γ_{\rm opt}$ converges to a nontrivial constant as $x_0 \to \infty$. In contrast, for $p=1$, there is no finite optimum and $γ_{\rm opt} \to \infty$ in this case. These analytical results are confirmed by our numerical simulations. |
| title | Optimal mean first-passage time of a run-and-tumble particle in a class of one-dimensional confining potentials |
| topic | Statistical Mechanics Soft Condensed Matter |
| url | https://arxiv.org/abs/2311.06923 |