"Three-body contact of the unitary Fermi gas"
Dr. Philipp Lunt
University of Heidelberg, Germany

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The unitary Fermi gas is a paradigmatic example of strongly interacting fermions with universal properties, connecting diverse areas of physics from ultracold atoms to nuclear matter and neutron stars. A key conceptual breakthrough in understanding this system was the identification of the two-body contact, which relates short-range two-body correlations to macroscopic thermodynamic properties. While two-body correlations have been extensively studied in experiments, direct access to higher-order correlations has remained elusive. Here, we measure the three-body contact of the unitary Fermi gas, enabling a quantitative characterisation of intrinsic three-body correlations and further emphasising the strongly correlated nature of the system.