Site percolation and random walks ond-dimensional Kagomé lattices

The site percolation problem is studied on d -dimensional generalizations of the Kagomé lattice. These lattices are isotropic and have the same coordination number q as the hyper-cubic lattices in d dimensions, namely q=2d . The site percolation thresholds are calculated numerically for d=3, 4, 5 , and 6. The scaling of these thresholds as a function of dimension d , or alternatively q , is different than for hypercubic lattices: instead of . The latter is the Bethe approximation, which is usually assumed to hold for all lattices in high dimensions. A series expansion is calculated, in order to understand the different behaviour of the Kagomé lattice. The return probability of a random walker on these lattices is also shown to scale as . For bond percolation on d -dimensional diamond lattices these results imply .