We investigate some aspects of the ageing behaviour 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 (epsilon = 4-d). 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.
|Titolo:||Ageing in the contact process: scaling behaviour and universal features|
|Autori:||BAUMANN F; GAMBASSI A|
|Rivista:||JOURNAL OF STATISTICAL MECHANICS: THEORY AND EXPERIMENT|
|Data di pubblicazione:||2007|
|Digital Object Identifier (DOI):||10.1088/1742-5468/2007/01/P01002|
|Appare nelle tipologie:||1.1 Journal article|