"Capturing the Elusive Second Sound: Physicists Measure Heat 'Sloshing' in Superfluid"

Physicists in the US have developed a new technique for monitoring "second sound," a peculiar heat wave that occurs in superfluids, which could help model various poorly understood systems. The technique involves imaging heat flow in a strongly interacting Fermi gas composed of ultracold lithium-6 atoms, providing direct measurements of heat transfer and anomalous behavior at critical temperatures. This research has implications for high-temperature superconductors, neutron stars, and other systems, and the new technique is expected to be applied in systems where the whole system is far from equilibrium.