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Title: Quasi-particle model for lattice QCD: quark-gluon plasma in heavy ion collisions
Authors: Chandra, Vinod
Ravishankar, V.
Issue Date: 12-Sep-2009
Publisher: Springer - Verlag
Citation: European Physical Journal-C, 2009, Vol.64, p63
Abstract: We propose a quasi-particle model to describe the lattice QCD equation of state for pure SU(3) gauge theory in its deconfined state, for T≥1.5T c. The method involves mapping the interaction part of the equation of state to an effective fugacity of otherwise non-interacting quasi-gluons. We find that this mapping is exact. Using the quasi-gluon distribution function, we determine the energy density and the modified dispersion relation for the single particle energy, in which the trace anomaly is manifest. As an application, we first determine the Debye mass, and then the important transport parameters, viz., the shear viscosity, η, and the shear viscosity to entropy density ratio, $\eta/{\mathcal{S}}$. We find that both η and $\eta/{\mathcal{S}}$ are sensitive to the interactions, and that the interactions significantly lower both η and $\eta/\mathcal{S}$.
Description: Restricted Access. An open-access version is available at (one of the alternative locations)
ISSN: 1434-6044
1434-6052 (Online)
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Copyright: 2009 Springer-Verlag
Appears in Collections:Research Papers (TP)

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