Growth exponents with 3.99 walkers.
It is argued that the dielectric-breakdown model has an upper critical eta(c) equal to 4, for which the clusters become one dimensional. A renormalization group treatment of the model is presented near the critical eta.
Hastings
M B
MB
CNLS, MS B258, Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA. hastings@cnls.lanl.gov