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VOLUME 62 (1995) | ISSUE 4 | PAGE 305
Two-parameter regularization of crossover from directed to isotropic percolation
A continuous Hamiltonian describing, as special cases, ordinary and directed percolations is investigated on the basis of a renormalization scheme with two small parameters (the deviation from the corresponding critical dimension and the crossover index). A new physical realization of such a model is proposed — percolation phase transitions in systems without an inversion center, for example, percolation-type transitions into a ferroelectric phase in some disordered crystals and ceramics. © 1995 American Institute of Physics.