First-order microcanonical transitions in finite mean-field models
| dc.creator | Antoni, Mickael | |
| dc.creator | Ruffo, Stefano | |
| dc.creator | Torcini, Alessandro | |
| dc.date | 2004-01-12 | |
| dc.date.accessioned | 2026-07-07T02:55:50Z | |
| dc.date.available | 2026-07-07T02:55:50Z | |
| dc.description | A microcanonical first order transition, connecting a clustered to a homogeneous phase, is studied from both the thermodynamic and dynamical point of view for a 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. | |
| dc.description | 7 pages, Latex - 6 EPS Figs - submitted to Europhys. Lett | |
| dc.identifier | https://arxiv.org/abs/cond-mat/0401177 | |
| dc.identifier | http://arxiv.org/abs/cond-mat/0401177 | |
| dc.identifier | Europhys. Lett., 66 (5), pp. 645-651 (2004) | |
| dc.identifier | doi:10.1209/epl/i2004-10028-6 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/23090 | |
| dc.subject | Statistical Mechanics | |
| dc.title | First-order microcanonical transitions in finite mean-field models | |
| dc.type | text |