Critical behaviour of nonequilibrium three-state systems

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Abstract
The phase diagram of two different nonequilibrium three-state systems is here studied by means of MFRG and computer simulations; critical exponents are obtained by a finite-size scaling analysis of the MC data. A symmetry argument used by Grinstein et al. to predict the critical behaviour of two-state nonequilibrium systems (with up-down symmetry) is shown to apply to these three-state systems (with symmetry of interchange between two of those states).