Stochastic thermodynamics of hidden pumps



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Esposito, Massimiliano and Rodríguez Parrondo, Juan Manuel (2015) Stochastic thermodynamics of hidden pumps. Physical Review E, 91 (5). 052114_1-052114_7. ISSN 1539-3755

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We show that a reversible pumping mechanism operating between two states of a kinetic network can give rise to Poisson transitions between these two states. An external observer, for whom the pumping mechanism is not accessible, will observe a Markov chain satisfying local detailed balance with an emerging effective force induced by the hidden pump. Due to the reversibility of the pump, the actual entropy production turns out to be lower than the coarse-grained entropy production estimated from the flows and affinities of the resulting Markov chain. Moreover, in presence of a large time scale separation between the fast-pumping dynamics and the slow-network dynamics, a finite current with zero dissipation may be produced. We make use of these general results to build a synthetase-like kinetic scheme able to reversibly produce high free-energy molecules at a finite rate and a rotatory motor achieving 100% efficiency at finite speed.

Item Type:Article
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© 2015 American Physical Society.
M.E. is supported by the National Research Fund, Luxembourg in the frame of project FNR/A11/02. J.M.R.P. acknowledges financial support from Grant ENFASIS (No. FIS2011-22644, Spanish Government). This work also benefited from the COST Action Grant No. MP1209.

Uncontrolled Keywords:Systems; Entropy
Subjects:Sciences > Physics > Nuclear physics
ID Code:32932
Deposited On:28 Aug 2015 07:27
Last Modified:10 Dec 2018 14:57

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