4 papers
Mean-field theory of the DNLS equation at positive and negative absolute temperatures
Michele Giusfredi, Stefano Iubini, Antonio Politi +1
The Discrete Non Linear Schrödinger (DNLS) model, due to the existence of two conserved quantities, displays an equilibrium transition between a homogeneous phase at positive abso…
Infinite-temperature thermostats by energy localization in a nonequilibrium setup
Michele Giusfredi, Stefano Iubini, Antonio Politi +1
Some lattice models having two conservation laws may display an equilibrium phase transition from a homogeneous (positive temperature - PT) to a condensed (negative temperature) ph…
Crisis in time-dependent dynamical systems
Simona Olmi, Antonio Politi
Many dynamical systems operate in a fluctuating environment. However, even in low-dimensional setups, transitions and bifurcations have not yet been fully understood. In this Lette…
Effective grand-canonical description of condensation in negative-temperature regimes
Stefano Iubini, Antonio Politi
The observation of negative-temperature states in the localized phase of the Discrete Nonlinear Schrödinger (DNLS) equation has challenged statistical mechanics for a long time. F…