## Abstract

We present analytical results for the distribution of first-passage (FP) times of random walks (RWs) on random regular graphs that consist of N nodes of degree c ⩾ 3. Starting from a random initial node at time t = 0, at each time step t ⩾ 1 an RW hops into a random neighbor of its previous node. In some of the time steps the RW may hop into a yet-unvisited node while in other time steps it may revisit a node that has already been visited before. We calculate the distribution P(T _{FP} = t) of first-passage times from a random initial node i to a random target node j, where j ≠ i. We distinguish between FP trajectories whose backbone follows the shortest path (SPATH) from the initial node i to the target node j and FP trajectories whose backbone does not follow the shortest path (¬SPATH). More precisely, the SPATH trajectories from the initial node i to the target node j are defined as trajectories in which the subnetwork that consists of the nodes and edges along the trajectory is a tree network. Moreover, the shortest path between i and j on this subnetwork is the same as in the whole network. The SPATH scenario is probable mainly when the length ℓ _{ij} of the shortest path between the initial node i and the target node j is small. The analytical results are found to be in very good agreement with the results obtained from computer simulations.

Original language | American English |
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Article number | 113403 |

Journal | Journal of Statistical Mechanics: Theory and Experiment |

Volume | 2022 |

Issue number | 11 |

DOIs | |

State | Published - 1 Nov 2022 |

### Bibliographical note

Funding Information:This work was supported by the Israel Science Foundation Grant No. 1682/18.

Publisher Copyright:

© 2022 IOP Publishing Ltd and SISSA Medialab srl.

## Keywords

- first passage
- network dynamics
- random graphs, networks
- stochastic processes