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Phase diagram of noisy systems of coupled oscillators with a bimodal frequency distribution
Alessandro Campa
We study the properties of large systems of globally coupled oscillators in the presence of noise. When the distribution of the natural frequencies of the oscillators is bimodal an…
Phase transitions in the unconstrained ensemble
Alessandro Campa, Lapo Casetti, Ivan Latella +1
The unconstrained ensemble describes completely open systems in which energy, volume and number of particles fluctuate. Here we show that not only equilibrium states can exist in t…
Ensemble inequivalence in the Blume-Emery-Griffiths model near a fourth order critical point
V. V. Prasad, Alessandro Campa, David Mukamel +1
The canonical phase diagram of the Blume-Emery-Griffiths (BEG) model with infinite-range interactions is known to exhibit a fourth order critical point at some negative value of th…
Ising chains with competing interactions in presence of long-range couplings
Alessandro Campa, Giacomo Gori, Vahan Hovhannisyan +2
In this paper we study an Ising spin chain with short-range competing interactions in presence of long-range ferromagnetic interactions in the canonical ensemble. The simultaneous…