ABSTRACT
We study the asymptotic shape of self-avoiding random walks (SAW) on the backbone of the incipient percolation cluster in d-dimensional lattices analytically. It is generally accepted that the configurational averaged probability distribution function
for the end-to-end distance r of an N step SAW behaves as a power law for r-->0. In this work, we determine the corresponding exponent using scaling arguments, and show that our suggested "generalized des Cloizeaux" expression for the exponent is in excellent agreement with exact enumeration results in two and three dimensions.
ABSTRACT
The random packing of identical and nonoverlapping rectangular particles of size nxm (1=n,m=10) is studied numerically on the square lattice, and the corresponding packing fractions p(f) and percolation probabilities P(infinity) are determined. We find that for randomly oriented particles there is a critical packing fraction p(c)(f)=0.67+/-0.01, such that for all particles sizes nxm for which p(f)
0 for L-->infinity, while when p(f)>p(c)(f),P(infinity)-->1 when L-->infinity and an infinite cluster exists. The value for p(c)(f) is found to be consistent with the continuum percolation threshold p(c) congruent with0.67 for overlapping particles in two dimensions.