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Motivated by recent findings, we discuss the existence of a direct and robustmechanism providing discontinuous absorbing transitions in short range systemswith single species, with no extra symmetries or conservation laws. We considervariants of the contact process, in which at least two adjacent particles(instead of one, as commonly assumed) are required to create a new species.Many interaction rules are analyzed, including distinct cluster annihilationsand a modified version of the original pair contact process (PCP). Throughdetailed time dependent numerical simulations we find that for our modifiedmodels, the phase transitions are of first-order, hence contrasting with theircorresponding usual formulations in the literature, which are of second-order.By calculating the order-parameter distributions, the obtained bimodal shapesas well as the finite scale analysis reinforce coexisting phases, so adiscontinuous transition. These findings strongly suggest that above particlecreation requirements constitute a minimum and fundamental mechanismdetermining the phase coexistence in short-range contact processes.

A minimal mechanism leading to discontinuous phase transitions for short-range systems with absorbing states