Evacuation in the Social Force Model is not stationary

@article{Gawronski2011EvacuationIT,
  title={Evacuation in the Social Force Model is not stationary},
  author={Przemyslaw Gawro'nski and Krzysztof Kułakowski and Mark A. Kampf and Jan W. Kantelhardt},
  journal={arXiv: Physics and Society},
  year={2011}
}
An evacuation process is simulated within the Social Force Model. Thousand pedestrians are leaving a room by one exit. We investigate the stationarity of the distribution of time lags between instants when two successive pedestrians cross the exit. The exponential tail of the distribution is shown to gradually vanish. Taking fluctuations apart, the time lags decrease in time till there are only about 50 pedestrians in the room, then they start to increase. This suggests that at the last stage… 

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