First-order microcanonical transitions in finite mean-field models (Articolo in rivista)

Type
Label
  • First-order microcanonical transitions in finite mean-field models (Articolo in rivista) (literal)
Anno
  • 2004-01-01T00:00:00+01:00 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi
  • 10.1209/epl/i2004-10028-6 (literal)
Alternative label
  • Antoni M. (1); Ruffo S. (2); Torcini A. (3,2,1) (2004)
    First-order microcanonical transitions in finite mean-field models
    in Europhysics letters (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Antoni M. (1); Ruffo S. (2); Torcini A. (3,2,1) (literal)
Pagina inizio
  • 645 (literal)
Pagina fine
  • 651 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume
  • 66 (literal)
Rivista
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note
  • EDP Sciences. (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#pagineTotali
  • 7 (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo
  • 5 (literal)
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • (1) UMR-CNRS 6171 - Université d'Aix-Marseille III, Av. Esc. Normandie-Niemen, 13397 Marseille Cedex 20, France (2) Dipartimento d'Energetica \"S. Stecco\" and CSDC, Università di Firenze, and INFN and INFM - via S. Marta 3, 50139 Firenze, Italy 3) Istituto Nazionale d'Ottica Applicata - Largo E. Fermi 6, 50125 Firenze, Italy (literal)
Titolo
  • First-order microcanonical transitions in finite mean-field models (literal)
Abstract
  • Amicrocanonical first-order transition, connecting a clustered to a homogeneous phase, is studied from both the thermodynamic and the dynamical point of view for an N-body Hamiltonian system with infinite-range couplings. In the microcanonical ensemble, specific heat can be negative, but besides that, a microcanonical first-order transition displays a temperature discontinuity as the energy is varied continuously (a dual phenomenon to the latent heat in the canonical ensemble). In the transition region, the entropy per particle exhibits, as a function of the order parameter, two relative maxima separated by a minimum. The relaxation of the metastable state is shown to be ruled by an activation process induced by intrinsic finite N fluctuations. In particular, numerical evidences are given that the escape time diverges exponentially with N, with a growth rate given by the entropy barrier. Introduction. (literal)
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