Please use this identifier to cite or link to this item: http://hdl.handle.net/2289/3906

 Title: Quasi-particle model for lattice QCD: quark-gluon plasma in heavy ion collisions Authors: Chandra, VinodRavishankar, 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 arXiv.org (one of the alternative locations) URI: http://hdl.handle.net/2289/3906 ISSN: 1434-60441434-6052 (Online) Alternative Location: http://arxiv.org/abs/0812.1430http://dx.doi.org/10.1140/epjc/s10052-009-1126-8http://adsabs.harvard.edu/abs/2009EPJC...64...63C Copyright: 2009 Springer-Verlag Appears in Collections: Research Papers (TP)

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