Hyperscaling relations in the bosonic pair contact process with diffusion

Details Hyperscaling relations in the bosonic pair contact process with diffusion Hyperscaling relations in the bosonic pair contact process with diffusion

2004-06-24

arxiv.org/abs/cond-mat/0406598v1

Physics

Condensed Matter

Statistical Mechanics

18 pages, 7 figures, 2 tables

Scientific paper

A hyperscaling relation for the critical exponents of absorbing phase transitions is tested in the bosonic pair contact process with diffusion. To this end spreading is considered, i.e. the time evolution out of an initial seed. It is shown that like in the case of spatial homogeneous initial conditions the autocorrelation function exhibits a phase transition at the critical point of the first moment. Some of the critical exponents can be determined exactly which is an unusual property of an absorbing phase transition and provides a possibility to test the hyperscaling relation. In the case of the bosonic pair contact process with diffusion three sets of exponents can be considered referring to the number of particles, number of pairs and number of active sites. It is argued that in special cases it is generally impossible to produce adequate data numerically.

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