2025/07/06 by Hall, Christian, Thomas Schaefer, Schaefer, Thomas
Mathematics · Physics and Astronomy · #FOS: Physical sciences #Gas Dynamics and Kinetic Theory #Nuclear Theory (nucl-th) #Numerical methods in inverse problems #Optical properties and cooling technologies in crystalline materials #Quantum Gases (cond-mat.quant-gas)
paper · pdf · doi:10.48550/arxiv.2507.04202
openalex publication_date 2025/07/06 · openalex created_date 2025/10/14 · openalex updated_date 2026/07/28
We compute the complete set of second order transport coefficients of the unitary Fermi gas, a dilute gas of spin 1/2 particles interacting via an s-wave interaction tuned to infinite scattering length. The calculation is based on kinetic theory and the Chapman-Enskog method at second order in the Knudsen expansion. We take into account the exact two-body collision integral. We extend previous results on second order coefficients related to shear stress by including terms related to heat flow and gradients of the fugacity. We confirm that the thermal relaxation time is given by the simple estimate τκ= κm/(cPT) even if the full collision kernel is taken into account. Here, κ is the thermal conductivity, m is the mass of the particles, cP is the specific heat at constant pressure, and T is the temperature.