Origin of the violation of the fluctuation–dissipation theorem in systems with activated dynamics

✍ Scribed by A. Pérez-Madrid; D. Reguera; J.M. Rubı́

• Publisher: Elsevier Science
• Year: 2003
• Tongue: English
• Weight: 135 KB
• Volume: 329
• Category: Article
• ISSN: 0378-4371
• DOI: 10.1016/s0378-4371(03)00634-4

✦ Synopsis

We analyze the validity of the uctuation-dissipation theorem for slow relaxation systems in the context of mesoscopic nonequilibrium thermodynamics. We demonstrate that the violation arises as a natural consequence of the elimination of fast variables in the description of a glassy system, and it is intrinsically related to the underlying activated nature of slow relaxation. In addition, we show that the concept of e ective temperature, introduced to characterize the magnitude of the violation, is not robust since it is observable-dependent, can diverge, or even be negative.