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Driving innovations in manufacturing: Open Access research from DMEM

Strathprints makes available Open Access scholarly outputs by Strathclyde's Department of Design, Manufacture & Engineering Management (DMEM).

Centred on the vision of 'Delivering Total Engineering', DMEM is a centre for excellence in the processes, systems and technologies needed to support and enable engineering from concept to remanufacture. From user-centred design to sustainable design, from manufacturing operations to remanufacturing, from advanced materials research to systems engineering.

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Absorbing state phase transitions with a non-accessible vacuum

Al Hammal, Omar and Bonachela, Juan A. and Muñoz, Miguel A. (2006) Absorbing state phase transitions with a non-accessible vacuum. Journal of Statistical Mechanics: Theory and Experiment, 2006 (12). ISSN 1742-5468

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Abstract

We analyse from the renormalization group perspective a universality class of reaction.diffusion systems with absorbing states. In this class, models where the vacuum state is not accessible are represented as the set of reactions 2A → A together with creation processes of the form A → nA with n ≥ 2. This class includes the (exactly solvable in one dimension) reversible model 2A ↔ A as a particular example, as well as many other non-reversible sets of reactions, proving that reversibility is not the main feature of this class as previously thought. By using field theoretical techniques we show that the critical point appears at zero creation rate (in accordance with known results for the reversible case) and it is controlled by the well known pair-coagulation renormalization group fixed point, with non-trivial exactly computable critical exponents in any dimension. Finally, we report on Monte Carlo simulations, confirming the field theoretical predictions in one and two dimensions for various reversible and non-reversible sets of reactions.