Scaling behavior of the absorbing phase transition in a conserved lattice gas around the upper critical dimension - art. no. 016123

We analyze numerically the critical behavior of a conserved lattice gas tha t was recently introduced as an example of the new universality class of ab sorbing phase transitions with a conserved field [Phys. Rev. Lett. 85, 1803 (2000)]. We determine the critical exponent of the order parameter as well as the critical exponent of the order parameter fluctuations in D=2,3,4,5 dimensions. A comparison of our results and those obtained from a mean-fiel d approach and a field theory suggests that the upper critical dimension of the absorbing phase transition is four.