Patterns of particle distribution in multiparticle systems by random walks with memory enhancement and decay.
We investigate the pattern of particle distribution and its evolution with time in multiparticle systems using the model of random walks with memory enhancement and decay. This model describes some biological intelligent walks. With decrease in the memory decay exponent alpha, the distribution of particles changes from a random dispersive pattern to a locally dense one, and then returns to the random one. Correspondingly, the fractal dimension D(f,p) characterizing the distribution of particle positions increases from a low value to a maximum and then decreases to the low one again. This is determined by the degree of overlap of regions consisting of sites with remanent information. The second moment of the density rho(2) was introduced to investigate the inhomogeneity of the particle distribution. The dependence of rho(2) on alpha is similar to that of D(f,p) on alpha. rho(2) increases with time as a power law in the process of adjusting the particle distribution, and then rho(2) tends to a stable equilibrium value.
Tan
Zhi-Jie
ZJ
Department of Physics, Wuhan University, Wuhan 430072, China.
Zou
Xian-Wu
XW
Huang
Sheng-You
SY
Zhang
Wei
W
Jin
Zhun-Zhi
ZZ