Physics – Data Analysis – Statistics and Probability
Scientific paper
2007-07-27
PHYSICAL REVIEW E 76, 061115 (2007)
Physics
Data Analysis, Statistics and Probability
revtex4, preprint, aps, 25 pages, 8 plots in 2 figures, submitted for publication; revised version, references changed and exp
Scientific paper
10.1103/PhysRevE.76.061115
The usual development of the continuous time random walk (CTRW) assumes that jumps and time intervals are a two-dimensional set of independent and identically distributed random variables. In this paper we address the theoretical setting of non-independent CTRW's where consecutive jumps and/or time intervals are correlated. An exact solution to the problem is obtained for the special but relevant case in which the correlation solely depends on the signs of consecutive jumps. Even in this simple case some interesting features arise such as transitions from unimodal to bimodal distributions due to correlation. We also develop the necessary analytical techniques and approximations to handle more general situations that can appear in practice.
Masoliver Jaume
Montero Miquel
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