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EnglishWe study the fluctuations of the Gaussian model, with conservation of the order parameter, evolving in contact with a thermal bath quenched from an initial inverse temperature eta_i to a final one eta_f. At every time there exists a critical value s_c(t) of the variance s of the order parameter per degree of freedom such that the fluctuations with s > s_c(t) are characterized by a macroscopic contribution of the zero wavevector mode, similarly to what occurs in an ordinary condensation transition. We show that the probability of fluctuations with s < inf_t[s_c(t)], for which condensation never occurs, rapidly converges towards a stationary behavior. By contrast, the process of populating the zero wavevector mode of the variance, which takes place for s > inf_t[s_c(t)], induces a slow non-equilibrium dynamics resembling that of systems quenched across a phase transition.
| Titolo: | Dynamics of fluctuations in the Gaussian model with conserved dynamics |
| Autori: | Corberi, Federico; Mazzarisi, Onofrio; Gambassi, Andrea |
| Rivista: | |
| Data di pubblicazione: | 2019 |
| Volume: | 2019 |
| Numero di Articolo: | 104001 |
| Digital Object Identifier (DOI): | 10.1088/1742-5468/ab3bc7 |
| Appare nelle tipologie: | 1.1 Journal article |
