Quantum Kinetic Theory of Collisionless Superfluid Internal Convection

TL;DR

This paper demonstrates that superfluid internal convection can occur in collisionless regimes of a dilute Bose gas, expanding understanding beyond traditional hydrodynamic models and suggesting experimental observability.

Contribution

It applies quantum kinetic theory to show superfluid internal convection in collisionless regimes, a phenomenon previously described only by hydrodynamics.

Findings

Internal convection occurs in collisionless regimes.

Phenomenon observable in current ultracold vapor experiments.

Extends superfluid heat transport understanding beyond hydrodynamics.

Abstract

Superfluids can transport heat via simultaneous opposite flows of their spatially interpenetrating condensate and thermal components. While this internal convection is usually described within Landau's phenomenological two fluid hydrodynamics, we apply quantum kinetic theory to a dilute Bose gas held beween thermal reservoirs at different temperatures, and show that the phenomenon also appears in collisionless kinetic regimes, and should be directly observable in currently feasible experiments on trapped ultracold vapors.