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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

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

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Ghosh, Sabyasachi [1] ; Peixoto, Thiago C. [1] ; Roy, Victor [2] ; Serna, Fernando E. [1] ; Krein, Gastao [1]
Total Authors: 5
[1] Univ Estadual Paulista, Inst Fis Teor, Rua Dr Bento Teobaldo Ferraz, 271 Bloco 2, BR-01140070 Sao Paulo - Brazil
[2] Goethe Univ Frankfurt, Inst Theoret Phys, Max von Laue Str 1, D-60438 Frankfurt - Germany
Total Affiliations: 2
Document type: Journal article
Source: Physical Review C; v. 93, n. 4 APR 13 2016.
Web of Science Citations: 21

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: 13/01907-0 - São Paulo Research and Analysis Center
Grantee:Sergio Ferraz Novaes
Support type: Research Projects - Thematic Grants
FAPESP's process: 09/50180-0 - Study of hadronic interactions at high energies
Grantee:Yogiro Hama
Support type: Research Projects - Thematic Grants
FAPESP's process: 12/16766-0 - Spectral ánd transport properties of charmed mesons ín hot ánd dense hadronic matter
Grantee:Sabyasachi Ghosh
Support type: Scholarships in Brazil - Post-Doctorate