| Full text | |
| Author(s): |
Ghosh, Sabyasachi
;
Peixoto, Thiago C.
;
Roy, Victor
;
Serna, Fernando E.
;
Krein, Gastao
Total Authors: 5
|
| Document type: | Journal article |
| Source: | PHYSICAL REVIEW C; v. 93, n. 4, p. 9-pg., 2016-04-13. |
| Abstract | |
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. (AU) | |
| FAPESP's process: | 09/50180-0 - Study of hadronic interactions at high energies |
| Grantee: | Yogiro Hama |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 13/01907-0 - São Paulo Research and Analysis Center |
| Grantee: | Sergio Ferraz Novaes |
| Support Opportunities: | Research Projects - Thematic Grants |
| FAPESP's process: | 12/16766-0 - Spectral and transport properties of charmed mesons in hot and dense hadronic matter |
| Grantee: | Sabyasachi Ghosh |
| Support Opportunities: | Scholarships in Brazil - Post-Doctoral |