Far from equilibrium dynamics of the Bose gas
Kedar Damle, Satya N. Majumdar, Subir Sachdev
Abstract
We study the approach to equilibrium of a Bose gas to a superfluid state. We point out that dynamic scaling, characteristic of far from equilibrium phase-ordering systems, should hold. We stress the importance of a non-dissipative Josephson precession term in driving the system to a new universality class. A model of coarsening in d=2, involving a quench between two temperatures below the equilibrium superfluid transition temperature (Tc), is exactly solved and demonstrates the relevance of the Josephson term. Numerical results on quenches from above Tc in d=2,3 provide evidence for the scaling picture postulated.
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