Universal Extremal Statistics in a Freely Expanding Jepsen Gas

Details Universal Extremal Statistics in a Freely Expanding Jepsen Gas Universal Extremal Statistics in a Freely Expanding Jepsen Gas

2007-01-07

arxiv.org/abs/cond-mat/0701130v2

Published in Physical Review E 75, 051103 (2007).

Physics

Condensed Matter

Statistical Mechanics

13 pages, 3 figures. To appear in Phys. Rev. E

Scientific paper

10.1103/PhysRevE.75.051103

We study the extremal dynamics emerging in an out-of-equilibrium one-dimensional Jepsen gas of $(N+1)$ hard-point particles. The particles undergo binary elastic collisions, but move ballistically in-between collisions. The gas is initally uniformly distributed in a box $[-L,0]$ with the "leader" (or the rightmost particle) at X=0, and a random positive velocity, independently drawn from a distribution $\phi(V)$, is assigned to each particle. The gas expands freely at subsequent times. We compute analytically the distribution of the leader's velocity at time $t$, and also the mean and the variance of the number of collisions that are undergone by the leader up to time $t$. We show that in the thermodynamic limit and at fixed time $t\gg 1$ (the so-called "growing regime"), when interactions are strongly manifest, the velocity distribution exhibits universal scaling behavior of only three possible varieties, depending on the tail of $\phi(V)$. The associated scaling functions are novel and different from the usual extreme-value distributions of uncorrelated random variables. In this growing regime the mean and the variance of the number of collisions of the leader up to time $t$ increase logarithmically with $t$, with universal prefactors that are computed exactly. The implications of our results in the context of biological evolution modeling are pointed out.

Affiliated with

Also associated with

No associations

Rating

Universal Extremal Statistics in a Freely Expanding Jepsen Gas does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.

If you have personal experience with Universal Extremal Statistics in a Freely Expanding Jepsen Gas, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Universal Extremal Statistics in a Freely Expanding Jepsen Gas will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFWR-SCP-O-369948