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- W2618411562 abstract "We study the bulk viscosity of quark matter in the strong coupling regime within the two-flavor Nambu--Jona-Lasinio model. The dispersive effects that lead to non-zero bulk viscosity arise from quark-meson fluctuations above the Mott transition temperature, where meson decay into two quarks is kinematically allowed. We adopt the Kubo-Zubarev formalism and compute the equilibrium imaginary-time correlation function for pressure in the $O(1/N_c)$ power counting scheme. The bulk viscosity of matter is expressed in terms of the Lorentz components of the quark spectral function and includes multi-loop contributions which arise via re-summation of infinite geometrical series of loop diagrams. We show that the multi-loop contributions dominate the single-loop contribution close to the Mott line, whereas at high temperatures the one-loop contribution is dominant. The multi-loop bulk viscosity dominates the shear viscosity close to the Mott temperature by factors 5 to 20, but with increasing temperature the shear viscosity becomes the dominant dissipation mechanism of stresses as the one-loop contribution becomes the main source of bulk viscosity." @default.
- W2618411562 created "2017-06-05" @default.
- W2618411562 creator A5054669989 @default.
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- W2618411562 date "2017-08-07" @default.
- W2618411562 modified "2023-09-24" @default.
- W2618411562 title "Bulk viscosity of two-flavor quark matter from the Kubo formalism" @default.
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- W2618411562 doi "https://doi.org/10.1103/physrevd.96.034006" @default.
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