Super-aging correlation function and ergodicity breaking in logarithmic potentials

Details Super-aging correlation function and ergodicity breaking in logarithmic potentials Super-aging correlation function and ergodicity breaking in logarithmic potentials

2012-02-28

arxiv.org/abs/1202.6250v1

Physics

Condensed Matter

Statistical Mechanics

16 pages, 6 figures

Scientific paper

We consider an overdamped Brownian particle moving in a confining asymptotically logarithmic potential, which supports a normalized Boltzmann equilibrium density. We derive analytical expressions for the two-time correlation function and the fluctuations of the time-averaged position of the particle for large but finite times. We characterize the occurrence of aging and nonergodic behavior as a function of the depth of the potential, and support our predictions with extensive Langevin simulations. While the Boltzmann measure is used to obtain stationary correlation functions, we show how the non-normalizable infinite covariant density is related to the super-aging behavior.

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