Volume 113, Number 2, January 2016
|Number of page(s)||5|
|Published online||22 February 2016|
Temperature response in nonequilibrium stochastic systems
1 Institut für Theoretische Physik, Universität Leipzig - Postfach 100 920, D-04009 Leipzig, Germany
2 Department of Physics and Astronomy, University of Padova - Via Marzolo 8, I-35131 Padova, Italy
3 INFN - Sezione di Padova - Via Marzolo 8, I-35131 Padova, Italy
Received: 22 December 2015
Accepted: 29 January 2016
The linear response to temperature changes is derived for systems with overdamped stochastic dynamics. Holding both in transient and steady-state conditions, the results allow to compute nonequilibrium thermal susceptibilities from unperturbed correlation functions. These correlations contain a novel form of entropy flow due to temperature unbalances, next to the standard entropy flow of stochastic energetics and to complementary time-symmetric dynamical aspects. Our derivation hinges on a time rescaling, which is a key procedure for comparing apparently incommensurable path weights. An interesting notion of thermal time emerges from this approach.
PACS: 05.40.-a – Fluctuation phenomena, random processes, noise, and Brownian motion / 05.70.Ln – Nonequilibrium and irreversible thermodynamics
© EPLA, 2016
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