An experiment with cold atoms confined in an isotropic three-dimensional harmonic potential confirms the long-predicted non-damping oscillations of the breathing mode. A gas in an isolated container ...

The arrow-of-time dilemma, how the irreversibility of the world around us emerges from the time-symmetric fundamental laws of physics, remains a puzzle. Boltzmann reconciled irreversibility with ...

We study the convergence to equilibrium of a class of nonlinear recombination models. In analogy with Boltzmann's H-theorem from kinetic theory, and in contrast with previous analysis of these models, ...