Optimizing Persistent Random Searches

V. Tejedor , R. Voituriez , O. Benichou

Bibtex , URL
Published 22 Feb. 2012
DOI: 10.1103/PhysRevLett.108.088103
ISSN: 0031-9007


We consider a minimal model of persistent random searcher with a short range memory. We calculate exactly for such a searcher the mean first-passage time to a target in a bounded domain and find that it admits a nontrivial minimum as function of the persistence length. This reveals an optimal search strategy which differs markedly from the simple ballistic motion obtained in the case of Poisson distributed targets. Our results show that the distribution of targets plays a crucial role in the random search problem. In particular, in the biologically relevant cases of either a single target or regular patterns of targets, we find that, in strong contrast to repeated statements in the literature, persistent random walks with exponential distribution of excursion lengths can minimize the search time, and in that sense perform better than any Levy walk.

Cette publication est associée à :

Dynamique stochastique des systèmes réactifs et vivants