Shear and bulk viscosities of quark matter from quark-meson fluctuations in the Nambu-Jona-Lasinio model

• Autor(a) principal: Ghosh, Sabyasachi [UNESP]
• Data de Publicação: 2016
• Outros Autores: Peixoto, Thiago C. [UNESP], Roy, Victor, Serna, Fernando E. [UNESP], Krein, Gastao [UNESP]
• Tipo de documento: Artigo
• Idioma: eng
• Título da fonte: Repositório Institucional da UNESP
• Texto Completo: http://dx.doi.org/10.1103/PhysRevC.93.045205; http://hdl.handle.net/11449/161409

We 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.