Brownian motion under annihilation dynamics

Details Brownian motion under annihilation dynamics Brownian motion under annihilation dynamics

2009-01-06

arxiv.org/abs/0901.0654v1

Phys. Rev. E 78, 061110 (2008)

Physics

Condensed Matter

Statistical Mechanics

Scientific paper

The behavior of a heavy tagged intruder immersed in a bath of particles evolving under ballistic annihilation dynamics is investigated. The Fokker-Planck equation for this system is derived and the peculiarities of the corresponding diffusive behavior are worked out. In the long time limit, the intruder velocity distribution function approaches a Gaussian form, but with a different temperature from its bath counterpart. As a consequence of the continuous decay of particles in the bath, the mean squared displacement increases exponentially in the collision per particle time scale. Analytical results are finally successfully tested against Monte Carlo numerical simulations.

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