1:30 pm MCP 201
Transport coefficients of a Bose gas in one dimension.
I will present two of our recent studies on transport coefficients of a Bose gas in one dimension. The first part is on the thermal conductivity [1], which is typically divergent for quantum integrable systems in one dimension. However, it is found to be finite and dominated by an effective three-body interaction that inevitably arises by confining bosons into a tight matter waveguide. The second part is on the bulk viscosity [2], which is computed perturbatively in the high-temperature, weak-coupling, and strong-coupling limits. In particular, the strong-coupling limit is accessible thanks to the Bose-Fermi duality, which is shown for the frequency-dependent complex bulk viscosity provided by the contact-contact response function.
[1] T. Tanaka and Y. Nishida, arXiv:2203.04936 [cond-mat.stat-mech] "Thermal conductivity of a weakly interacting Bose gas by quasi-one dimensionality"
[2] T. Tanaka and Y. Nishida, arXiv:2206.07848 [cond-mat.quant-gas] "Bulk viscosity of dual Bose and Fermi gases in one dimension"