The pair contact process with diffusion - a new type of nonequilibrium critical behavior?

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  • 13 January 2000
Abstract
Recently Carlon et. al. demonstrated that the pair contact process with diffusion exhibits an unconventional phase transition from an active phase into two absorbing states [cond-mat/9912347]. Using density matrix renormalization group methods they estimated the critical exponents, conjecturing that the transition should belong to the same universality class as branching annihilating random walks with even number of offspring. This result is surprising since the model does not have an explicit parity-conserving symmetry. In order to investigate the transition in more detail, we estimate the critical exponents by Monte Carlo simulations. The values deviate from the previous estimates, suggesting that the transition might belong to a different universality class which has not yet been investigated before.

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