We consider in this paper, a few important issues in non-equilibrium work fluctuations and their relations to equilibrium free energies. First we show that the Jarzynski identity can be viewed as a cumulant expansion of work. For a switching process which is nearly quasistatic the work...

The ground state and low-lying collective modes of Bose–Einstein condensate (BEC) of atoms with arbitrary spin in a magnetic field is studied using Bogoliubov's model for weakly interacting Bose gas. The equation for vectorial order parameter valid at temperature T→0 is derived and its...

We study protein folding by introducing a simplified one-dimensional analogy of a protein consisting of N contacts. Closed contacts are assigned a binding energy while open contacts represent several configurations of equal (zero) energy. Furthermore, two neighboring contacts in different states...

A linear chain of alternate Ising spins σ=1 and S=32, with bi-linear, bi-quadratic, single-ion and Zeeman interactions is studied. It is shown that this system can be mapped onto an effective BEG model, by the use of an extended decoration transformation. Exact results are obtained for the...

Based on the analysis of the geometrical confinements and the interactions between neighbor segments in polymeric systems, besides the quasi-lattice model used in Gibbs–DiMarzio entropy theory, an alternative theoretical method was developed here to investigate the thermodynamic aspect of the...

We develop a generalized theory of (meta)equilibrium statistical mechanics in the thermodynamic limit valid for both smooth and fractal phase spaces. In the former case, our approach leads naturally to Boltzmann–Gibbs standard thermostatistics while, in the latter, Tsallis thermostatistics is...

We focus attention on the particular thermodynamic relation dU=TdS+δW. Using information theory concepts we show that, for a reversible process in which intensive variables change, microscopic considerations related to this thermodynamic relation make the informational contents of,...