Shear Viscosities from Kubo Formalism
| Autor: | Lang, Robert |
|---|---|
| EAN: | 9783838151304 |
| Sachgruppe: | Physik, Astronomie |
| Sprache: | Englisch |
| Seitenzahl: | 144 |
| Produktart: | Kartoniert / Broschiert |
| Veröffentlichungsdatum: | 08.02.2017 |
| Untertitel: | in a Large-Nc Nambu-Jona-Lasinio Model |
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The quark-gluon plasma produced in heavy-ion collisions at RHIC and LHC is a hot and dense state of strongly correlated matter. It behaves like an almost-perfect fluid featuring a small ratio of shear viscosity to entropy density. In this thesis we calculate within a two-flavor Nambu--Jona-Lasinio model the shear viscosity as function of temperature and chemical potential. A new Kubo formula is developed, incorporating the full Dirac structure of the quark spectral function and avoiding commonly used on-shell approximations. Mesonic fluctuations occurring at Fock level provide the dominant dissipative process. The resulting parameter-free ratio is an overall decreasing function of temperature and chemical potential. In combination with hard-thermal-loop results we find this ratio to feature a minimum slightly above the AdS/CFT benchmark.
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