A correlation time approximation that keeps the second level of the BBGKY hierarchy yields analytic conserved correlators with new nonhydrodynamic cuts and a negative O(sigma_hat) correction to eta/s.
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Towards the BBGKY hierarchy: a scheme beyond the Boltzmann equation and application to a weakly confined QCD gas
A correlation time approximation that keeps the second level of the BBGKY hierarchy yields analytic conserved correlators with new nonhydrodynamic cuts and a negative O(sigma_hat) correction to eta/s.