A system of bosons studied within the mean field framework has two fascinating phenomena: a liquid-gas first order phase transition and Bose-Einstein condensation. Interplay between these phenomena is being investigated. Depending on mean-field potential parameters one can observe types critical points, called "Boltzmann" "Bose", that belong to different universality classes with distinct sets ...

The branching ratio of the Epidemic-Type Aftershock Sequence model using spatial variability background rate is substantially lower than previously reported a space invariant rate, demonstrating that Earth's crust at subcritical rather critical state.

We present a study of the critical phenomena around the quantum critical point in heavy-fermion systems. In the framework of the S = 1/2 Kondo lattice model, we introduce an extended decoupling scheme of the Kondo interaction which allows one to treat the spin fluctuations and the Kondo effect on an equal footing. The calculations, developed in a self-consistent one-loop approximation, lead to ...