Articoli in riviste
|Ageing in the contact process: Scaling behavior and universal features|
|Baumann F. and Gambassi A.|
|J. Stat. Mech. (2007) P01002|
|DOI : 10.1088/1742-5468/2007/01/P01002|
|ArXiv : cond-mat/0610260 [PDF]|
We investigate some aspects of the ageing behavior observed in the contact process after a quench from its active phase to the critical point. In particular we discuss the scaling properties of the two-time response function and we calculate it and its universal ratio to the two-time correlation function up to first order in the field-theoretical epsilon-expansion. The scaling form of the response function does not fit the prediction of the theory of local scale invariance. Our findings are in good qualitative agreement with recent numerical results.