Thermodynamics of nonequilibrium radiation. (I) General theory

Vasconcellos, Áurea R.; Fort, Joaquim; Jou, David; Luzzi, Roberto

doi:10.1016/s0378-4371(01)00346-6

Cited by 6 publications

(2 citation statements)

References 44 publications

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“…In addition, the Gaussian approximation of the distribution functions make especially easy to define temperatures, while additional conceptual problems would appear if the distribution function deviates far from the Gaussian. For instance, there have been some maximum-entropy analyses of nonequilibrium radiation, where nonequilibrium temperature or quasitemperature per mode have been defined in terms of the nonequilibrium populations of the different modes, in the context of a generalized Planck statistics instead of a classical Boltzmann statistics [14]. The present situation has the advantages of the higher simplicity and of the possibility of devising numerical simulations concerning operational temperature which have not been done before.…”

Section: B Comparison With the Results Of Nonequilibrium Molecular Dy...mentioning

confidence: 99%

Measuring nonequilibrium temperature of forced oscillators

Hatano¹,

Jou

2003

Phys. Rev. E

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The meaning of temperature in nonequilibrium thermodynamics is considered by using a forced harmonic oscillator in a heat bath, where we have two effective temperatures for the position and the momentum, respectively. We propose a concrete model of a thermometer to testify the validity of these different temperatures from the operational point of view. It is found that the measured temperature depends on a specific form of interaction between the system and a thermometer, which means that the zeroth law of thermodynamics cannot be immediately extended to nonequilibrium cases.

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Section: B Comparison With the Results Of Nonequilibrium Molecular Dy...mentioning

confidence: 99%

Measuring nonequilibrium temperature of forced oscillators

Hatano¹,

Jou

2003

Phys. Rev. E

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“…They give rise to so-called hybrid excitations (since the interaction is bilinear the Hamiltonian can be diagonalized by a unitary transformation), for example, polaritons 55 (hybridization of transverse optical phonons and the photons of the accompanying black-body radiation: their nonequilibrium thermostatistics is discussed in Ref. 56), hybridization of plasmons and longitudinal optical phonons, and other cases.…”

Section: Validation and An Illustrationmentioning

confidence: 99%

Termodinâmica estatística de não-equilíbrio da condensação de Fröhlich-Bose-Einstein de mágnons excitados

Vannucchi¹,

Luzzi²

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We describe, in a short overview, the construction of a Nonequilibrium Statistical Mechanics Ensemble Formalism, providing a thermo-statistical theory of kinetic and relaxation processes. Such construction has been approached along the recently past 20th century by a pleiad of distinguished scientists, a work that can be subsumed in a large systematization in the form of a physically sound, general and useful, theoretical framework. We briefly comment on the main questions associated to that construction. Among them are the relevant ones of choice of the basic variables, and of historicity and irreversibility. The derivation of a nonequilibrium grand-canonical statistical operator and a brief description of the all-important accompanying Nonlinear Quantum Kinetic Theory of relaxation processes are presented. The aspect of validation of the theory (comparison of theory and experiment) is reviewed in compact form, and its use is illustrated in a study of a nonequilibrium system of quantum oscillators embedded in a thermal bath and under the action of an external force, showing how a far-reaching generalization of Mori-Langevin equations arises.

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