Can one measure negative specific heat in the canonical statistical ensemble?
Autor: | Staniscia, F., Turchi, A., Fanelli, D., Chavanis, P. H., De Ninno, G. |
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Rok vydání: | 2010 |
Předmět: | |
Druh dokumentu: | Working Paper |
DOI: | 10.1063/1.3569558 |
Popis: | According to thermodynamics, the specific heat of Boltzmannian short-range interacting systems is a positive quantity. Less intuitive properties are instead displayed by systems characterized by long-range interactions. In that case, the sign of specific heat depends on the considered statistical ensemble: negative specific heat can be found in isolated systems, which are studied in the framework of the microcanonical ensemble; on the other hand, it is generally recognized that a positive specific heat should always be measured in systems in contact with a thermal bath, for which the canonical ensemble is the appropriate one. We demonstrate that the latter assumption is not generally true: one can in principle measure negative specific heat also in the canonical ensemble if the system under scrutiny is non-Boltzmannian and/or out-of-equilibrium. Comment: 5 pages, 3 figures |
Databáze: | arXiv |
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