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Occupancy of a single site by many random walkers
Boguñá, Marián; Berezhkovskii, A. M.; Weiss, George H. (George Herbert), 1930-
Universitat de Barcelona
We consider an infinite number of noninteracting lattice random walkers with the goal of determining statistical properties of the time, out of a total time T, that a single site has been occupied by n random walkers. Initially the random walkers are assumed uniformly distributed on the lattice except for the target site at the origin, which is unoccupied. The random-walk model is taken to be a continuous-time random walk and the pausing-time density at the target site is allowed to differ from the pausing-time density at other sites. We calculate the dependence of the mean time of occupancy by n random walkers as a function of n and the observation time T. We also find the variance for the cumulative time during which the site is unoccupied. The large-T behavior of the variance differs according as the random walk is transient or recurrent. It is shown that the variance is proportional to T at large T in three or more dimensions, it is proportional to T3/2 in one dimension and to TlnT in two dimensions.
2011-07-26
Física estadística
Termodinàmica
Sistemes no lineals
Física matemàtica
Statistical physics
Thermodynamics
Nonlinear systems
Mathematical physics
(c) American Physical Society, 2000
Article
The American Physical Society
         

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