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Boston MA (SPX) Feb 12, 2024 - In most materials, heat prefers to scatter. If left alone, a hotspot will gradually fade as it warms its surroundings. But in rare states of matter, heat can behave as a wave, moving back and forth
Heat scatters in most materials, fading hotspots as it warms. Rarely, it behaves like a wave—physicists call it "second sound."
For the first time, MIT physicists have captured direct images of “second sound,” the movement of heat sloshing back and forth within a superfluid. The results will expand scientists’ understanding of heat flow in superconductors and neutron stars.