Abstract
Thermodynamic transport coefficients can be calculated directly from quantum field theory without requiring analytic continuation to real time. We determine all second-order thermodynamic transport coefficients for the uncharged N-component massless (critical) scalar field theory with quartic interaction in the large N limit, for any value of the coupling. We find that in the large N limit, all thermodynamic transport coefficients for the interacting theory can be expressed analytically in terms of the in-medium mass and sums over modified Bessel functions. We expect our technique to allow a similar determination of all thermodynamic transport coefficients for all theories that are solvable in the large N limit, including certain gauge theories.
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Weiner, M., Romatschke, P. Determining all thermodynamic transport coefficients for an interacting large N quantum field theory. J. High Energ. Phys. 2023, 46 (2023). https://doi.org/10.1007/JHEP01(2023)046
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DOI: https://doi.org/10.1007/JHEP01(2023)046