Time-average based on scaling law in anomalous diffusions

摘要

To solve the obscureness in measurement brought about from the weak ergodicity breaking appeared in anomalous diffusions, we have suggested the time-averaged mean squared displacement (MSD) <(delta(2)(tau)(tau))over bar> with an integral interval depending linearly on the lag time tau. For the continuous time random walk describing a subdiffusive behavior, we have found that <(delta(2) (tau)(tau))over bar> similar to tau(gamma). like that of the ensemble-averaged MSD, which makes it be possible to measure the proper exponent values through time-average in experiments like a single molecule tracking. Also, we have found that it has originated from the scaling nature of the MSD at an aging time in anomalous diffusion and confirmed them through numerical results of the other microscopic non-Markovian model showing subdiffusions and superdiffusions with the origin of memory enhancement.