Abstract

Random walks are simulated on finite stages of construction of Sierpinski carpets and it is shown that the mean number of distinct visited sites 〈 S N 〉 by N-step walks obeys finite-size scalling. The relation 〈S N〉 ∼ N D F D w ( In N) α is proved to hold in the fractal limit, where D F and D w are the fractal and the random walk dimensions, respectively, and α is a positive exponent. This confirms the Alexander-Orbach scaling relation D s = 2D F D w . We discuss the origin of the logarithmic correction and the dependence of α on D F, the lacunarity and the ramification of the fractals.

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