Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2007-04-24
Physics
Condensed Matter
Statistical Mechanics
submitted to Physical Review E
Scientific paper
10.1103/PhysRevE.78.041117
The critical behavior of the contact process in disordered and periodic binary 2d-lattices is investigated numerically by means of Monte Carlo simulations as well as via an analytical approximation and standard mean field theory. Phase-separation lines calculated numerically are found to agree well with analytical predictions around the homogeneous point. For the disordered case, values of static scaling exponents obtained via quasi-stationary simulations are found to change with disorder strength. In particular, the finite-size scaling exponent of the density of infected sites approaches a value consistent with the existence of an infinite-randomness fixed point as conjectured before for the 2d disordered CP. At the same time, both dynamical and static scaling exponents are found to coincide with the values established for the homogeneous case thus confirming that the contact process in a heterogeneous environment belongs to the directed percolation universality class.
Fallert S. V.
Kim Matthew Yongsok
Neugebauer C. J.
Taraskin Sergei N.
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