Artículos de revistas
Shear and bulk viscosities of quark matter from quark-meson fluctuations in the Nambu-Jona-Lasinio model
Fecha
2016-04-13Registro en:
Physical Review C, v. 93, n. 4, 2016.
2469-9993
2469-9985
10.1103/PhysRevC.93.045205
2-s2.0-84964344862
Autor
Universidade Estadual Paulista (UNESP)
Johann Wolfgang Goethe-Universität
Institución
Resumen
We have calculated the temperature dependence of shear η and bulk ζ viscosities of quark matter due to quark-meson fluctuations. The quark thermal width originating from quantum fluctuations of quark-π and quark-σ 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 η/s and ζ/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 η/s has a minimum very close to the quantum lower bound, η/s=1/4π.