Abstract
We explore the analytical properties of the traceless stress tensor 2-point function at zero momentum and small frequency (relevant for shear viscosity and hydrodynamic response) in hot, weakly coupled λϕ4 theory. We show that, rather than one or a small number of poles, the correlator has a cut along the negative imaginary frequency axis. We briefly discuss this result’s relevance for constructing 2’nd order hydrodynamic models of hot relativistic field theories.
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Moore, G.D. Stress-stress correlator in ϕ4 theory: poles or a cut?. J. High Energ. Phys. 2018, 84 (2018). https://doi.org/10.1007/JHEP05(2018)084
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DOI: https://doi.org/10.1007/JHEP05(2018)084