Annihilation of an AB/BA interface pair in superfluid helium-3 as a simulation of cosmological brane interaction.

This study presents measurements of the transport of quasiparticle excitations in the B phase of superfluid 3He at temperatures below 0.2Tc. We find that creating and then removing a layer of A-phase superfluid leads to a measurable increase in the thermal impedance of the background B phase.