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Thermal Contact. II. A Solvable Toy Model
, 2013
"... A toy model for thermal contact consists of a twospin system, where each spin is flipped by a thermostat. The transition rates are determined from the modified detailed balance discussed in Ref.[1]. Generalized heat capacities, excess heats, the housekeeping entropy flow and the thermal conductivit ..."
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A toy model for thermal contact consists of a twospin system, where each spin is flipped by a thermostat. The transition rates are determined from the modified detailed balance discussed in Ref.[1]. Generalized heat capacities, excess heats, the housekeeping entropy flow and the thermal conductivity are calculated. The joint probability distribution of the heat cumulated exchanges at any time is computed explicitly. We obtain the large deviation function of heat transfer via a variety of approaches. In particular, by a saddlepoint method performed accurately, we obtain the explicit expressions not only of the large deviation function, but also of the amplitude prefactor, in the longtime probability density for the heat current. The following physical properties are discussed: the effects of typical time scales of the mesoscopic dynamics which do not appear in equilibrium statistical averages and the limit of purely energy dissipation towards a thermostat when its temperature goes to zero. We also derive some properties of the fluctuations in the twospin system viewed as a thermal machine performing thermodynamical cycles. PACS: 05.70.Ln, 02.50.Ga, 05.60.Cd
This content has been downloaded from IOPscience. Please scroll down to see the full text. Thermal contact through a diathermal wall: a solvable toy model Thermal contact through a diathermal wall: a solvable toy model Thermal contact through a diathermal
"... Abstract. A diathermal wall between two heat baths at different temperatures can be mimicked by a layer of independent spin pairs with some internal energy and where each spin σ a is flipped by thermostat a (a = 1, 2). The transition rates are determined from the modified detailed balance. Generali ..."
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Abstract. A diathermal wall between two heat baths at different temperatures can be mimicked by a layer of independent spin pairs with some internal energy and where each spin σ a is flipped by thermostat a (a = 1, 2). The transition rates are determined from the modified detailed balance. Generalized heat capacities, excess heats, the housekeeping entropy flow and the thermal conductivity in the steady state are calculated. The joint probability distribution of the heat cumulated exchanges at any time is computed explicitly. We obtain the large deviation function of heat transfer via a variety of approaches. In particular, by a saddlepoint method performed accurately, we obtain the explicit expressions not only of the large deviation function, but also of the amplitude prefactor, in the longtime probability density for the heat current. The following physical properties are discussed: the effects of typical time scales of the mesoscopic dynamics which do not appear in equilibrium statistical averages and the limit of strict energy dissipation towards a thermostat when its temperature goes to zero.
Affinity and Fluctuations in a Mesoscopic Noria
, 2014
"... We exhibit the invariance of cycle affinities in finite state Markov processes under various natural probabilistic constructions, for instance under conditioning and under a new combinatorial construction that we call “drag and drop”. We show that cycle affinities have a natural probabilistic meani ..."
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We exhibit the invariance of cycle affinities in finite state Markov processes under various natural probabilistic constructions, for instance under conditioning and under a new combinatorial construction that we call “drag and drop”. We show that cycle affinities have a natural probabilistic meaning related to first passage nonequilibrium fluctuation relations that we establish.