Revisiting the quasi-particle model of the quark–gluon plasma |
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Authors: | VM Bannur |
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Institution: | (1) Department of Physics, University of Calicut , Kerala, 673 635, India |
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Abstract: | The quasi-particle model of the quark–gluon plasma (QGP) is revisited here with a new method, different from earlier studies,
one without the need of a temperature dependent bag constant and other effects such as confinement, effective degrees of freedom
etc. Our model has only one system dependent parameter and shows a surprisingly good fit to the lattice results for the gluon
plasma, and for 2-flavor, 3-flavor and (2+1)-flavor QGP. The basic idea is first to evaluate the energy density ε from the
grand partition function of quasi-particle QGP, and then derive all other thermodynamic functions from ε. Quasi-particles
are assumed to have a temperature dependent mass equal to the plasma frequency. Energy density, pressure and speed of sound
at zero chemical potential are evaluated and compared with the available lattice data. We further extend the model to a finite
chemical potential, without any new parameters, to obtain the quark density, quark susceptibility etc., and the model fits
very well with the lattice results on 2-flavor QGP.
PACS 12.38.Mh; 12.38.Gc; 05.70.Ce; 52.25.Kn |
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Keywords: | |
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