[AD 7] Unrealistic Leptocurtic Mechanism

Unfortunately, it turned out that the narrow Gaussian velocity phase distribution achieves the leptocurtic behaviour by an unrealistic mechanism: The momentary velocity (in x- and y-directions) has a strong peak exactly at the center of the simulation time interval:



This leads to a huge step in the displacements:



This in turn leads to some isolated contributions in the far tail of the step width distribution, which causes the positive cutosis.



This is not what we are looking for.