Maximum Distance Between the Leader and the Laggard for Three Brownian Walkers

Details Maximum Distance Between the Leader and the Laggard for Three Brownian Walkers Maximum Distance Between the Leader and the Laggard for Three Brownian Walkers

2010-06-30

arxiv.org/abs/1006.5834v1

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

We consider three independent Brownian walkers moving on a line. The process terminates when the left-most walker (the `Leader') meets either of the other two walkers. For arbitrary values of the diffusion constants D_1 (the Leader), D_2 and D_3 of the three walkers, we compute the probability distribution P(m|y_2,y_3) of the maximum distance m between the Leader and the current right-most particle (the `Laggard') during the process, where y_2 and y_3 are the initial distances between the leader and the other two walkers. The result has, for large m, the form P(m|y_2,y_3) \sim A(y_2,y_3) m^{-\delta}, where \delta = (2\pi-\theta)/(\pi-\theta) and \theta = cos^{-1}(D_1/\sqrt{(D_1+D_2)(D_1+D_3)}. The amplitude A(y_2,y_3) is also determined exactly.

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