Andreev-Bashkin Effect: A Cold Atom / Nuclear Analogy

Superfluid entrainment is a frictionless drag effect predicted to be present in a wide variety of multi-component systems. Though proposed by Andreev and Bashkin in 1975, it has yet to be measured directly. Recent advances in cold-atom experiments make miscible superfluids attractive candidates for investigation, but it has proven difficult to design experiments to observe this effect. In contrast, entrainment plays a significant role in nuclear dynamics, with measurable effects through the giant-dipole resonance (GDR). In this poster, I will discuss how proton-neutron entrainment affects the GDR in density functional models of nuclei. Specifically, entrainment is included in a two-component superfluid model of nuclei through a modified Galilean invariant kinetic term. This analogy with nuclei may provide insight about how similar effects could be seen in cold-atom systems.