Davis, Sergio2023-03-222023-03-222022-12-15Physica A: Statistical Mechanics and its Applications Volume 60815 December 2022 Article number 1282490378-4371https://repositorio.unab.cl/xmlui/handle/ria/47755Indexación: ScopusAlthough generalized ensembles have now been in use in statistical mechanics for decades, including frameworks such as Tsallis’ nonextensive statistics and superstatistics, a classification of these generalized ensembles outlining the boundaries of validity of different families of models, is still lacking. In this work, such a classification is proposed in terms of supercanonical and subcanonical ensembles, according to a newly defined parameter, the inverse temperature covariance parameter U. This parameter is non-negative in superstatistics (and is equal to the variance of the inverse temperature) but can be negative for other families of statistical ensembles, acquiring then a broader meaning. It is shown that U is equal for every region of a composite system in a steady state, and examples are given of supercanonical and subcanonical states. © 2022 Elsevier B.V.enNonequilibriumSuperstatisticsTemperature correlationsArtículoAtribución-NoComercial-SinDerivadas 4.0 Internacional (CC BY-NC-ND 4.0)10.1016/j.physa.2022.128249