Journal ArticleUniversal density shift coefficients for the thermal conductivity and shear viscosity of a unitary Fermi gasLi, Xiang; Huang, J; Thomas, J E<p>We measure universal temperature-independent density shifts for the thermal conductivity<math><msub><mi>κ</mi><mi>T</mi></msub></math>and shear viscosity<math><mi>η</mi></math>, relative to the high temperature limits, for a normal phase unitary Fermi gas confined in a box potential. We show that a time-dependent kinetic theory model enables extraction of the hydrodynamic transport times<math><msub><mi>τ</mi><mi>η</mi></msub></math>and<math><msub><mi>τ</mi><mi>κ</mi></msub></math>from the time-dependent free decay of a spatially periodic density perturbation, yielding the static transport properties and density shifts, corrected for finite relaxation times.</p> <sec><supplementary-material><permissions><copyright-statement>Published by the American Physical Society</copyright-statement><copyright-year>2024</copyright-year></permissions></supplementary-material></sec>American Physical Society2024-10-0110588029Physical Review Research642643-1564https://doi.org/10.1103/PhysRevResearch.6.L0420212307107Fermi gasuniform density, unitary, hydrodynamicsNational Science Foundation