Year: 2002
Type: article
Abstract: We study the off-equilibrium response and correlation functions and the corresponding fluctuation-dissipation ratio for a purely dissipative relaxation of an O(N) symmetric vector model (model A) below its upper critical dimension. The scaling behavior of these quantities is analyzed and the associated universal functions are determined at first order in epsilon=4-d in the high-temperature phase and at criticality. A nontrivial limit of the fluctuation-dissipation ratio is found in the aging regime X( infinity )=1/2(1-(epsilon/4)(N+2)/(N+8))+O(epsilon(2)).
Authors: Pasquale Calabrese, Andrea Gambassi
Institution: Scuola Normale Superiore
Language: English
Subfield: Condensed Matter Physics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: green
OpenAlex ID: W2030759486