First-order phase transition in a one-dimensional nonequilibrium model

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Abstract
We present an example of a single-component, one-dimensional interacting particle system with a discontinuous transition into an absorbing state. The basic processes in the model are spontaneous annihilation (X→0), autocatalytic creation by trimers (3X→4X), and hopping. The transition is continuous, and in the directed percolation class, for low diffusion rates, and first order for sufficiently high diffusion rates. The transition in a similar model with creation by pairs (2X→3X) remains continuous even at high diffusion rates.

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