Vacuum Energy, EoS, and the Gluon Condensate at Finite Baryon Density in QCD

Physics – High Energy Physics – High Energy Physics - Phenomenology

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Talk at " Quark Confinement and the Hadron Spectrum VII", Ponta Delgada, September 2-7, 2006

Scientific paper

10.1063/1.2714459

The Equation of States (EoS) plays the crucial role in all studies of neutron star properties. Still, a microscopical understanding of EoS remains largely an unresolved problem. We use 2-color QCD as a model to study the dependence of vacuum energy (gluon condensate in QCD) as function of chemical potential \mu\ll \Lambda_{QCD} where we find very strong and unexpected dependence on $\mu$. We present the arguments suggesting that similar behavior may occur in 3-color QCD in the color superconducting phases. Such a study may be of importance for analysis of EoS when phenomenologically relevant parameters (within such models as MIT Bag model or NJL model) are fixed at zero density while the region of study lies at much higher densities not available for terrestrial tests.

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