Chiral condensates and size of the sigma term
arXiv:nucl-th/0412105 · doi:10.1016/j.nuclphysa.2004.09.058
Abstract
The in-medium chiral condensate is studied with a new approach which has the advantage of no need for extra assumptions on the current mass derivatives of model parameters. It is shown that the pion-nucleon sigma term is 9/2 times the average current mass of light quarks, if quark confinement is linear. Considering both perturbative and non-perturbative interactions, the chiral condensate decreases monotonously with increasing densities, approaching to zero at about 4 fm^{-3}.
arXiv comment11 pages, 1 figure, elsart style
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- Thermodynamics with density and temperature dependent particle masses and properties of bulk strange quark matter and strangelets
- Thermodynamic consistency, quark mass scaling, and properties of strange matter
- Charge, strangeness and radius of strangelets
- Renormalization group dependence of the QCD coupling
- Pion-nucleon Sigma Term in the Global Color Model of QCD
- Strange quark stars: the role of excluded volume effects