Ghosh, Sabyasachi [UNESP]Peixoto, Thiago C. [UNESP]Roy, VictorSerna, Fernando E. [UNESP]Krein, Gastao [UNESP]2018-11-262018-11-262016-04-13Physical Review C. College Pk: Amer Physical Soc, v. 93, n. 4, 9 p., 2016.2469-9985http://hdl.handle.net/11449/161409We have calculated the temperature dependence of shear eta and bulk zeta viscosities of quark matter due to quark-meson fluctuations. The quark thermal width originating from quantum fluctuations of quark-pi and quark-sigma loops at finite temperature is calculated with the formalism of real-time thermal field theory. Temperature-dependent constituent-quark and meson masses and quark-meson couplings are obtained in the Nambu-Jona-Lasinio model. We found a nontrivial influence of the temperature-dependent masses and couplings on the Landau-cut structure of the quark self-energy. Our results for the ratios eta/s and zeta/s, where s is the entropy density (also determined in the Nambu-Jona-Lasinio model in the quasiparticle approximation), are in fair agreement with results of the literature obtained from different models and techniques. In particular, our result for eta/s has a minimum very close to the quantum lower bound, eta/s = 1/4 pi.9engArtigo10.1103/PhysRevC.93.045205WOS:000373881100002Acesso abertoWOS000373881100002.pdf