Physics – Nuclear Physics – Nuclear Theory
Scientific paper
2003-01-01
Nucl.Phys. A736 (2004) 203-219
Physics
Nuclear Physics
Nuclear Theory
24 pages, 2 tables, 8 figures, references added, figures and text improved
Scientific paper
10.1016/j.nuclphysa.2004.02.022
The equation of state for quark matter is derived for a nonlocal, chiral quark model within the mean field approximation.We investigate the effects of a variation of the formfactors of the interaction on the phase diagram of quark matter. Special emphasis is on the occurrence of a diquark condensate which signals a phase transition to color superconductivity and its effects on the equation of state under the condition of beta- equilibrium and charge neutrality. We calculate the quark star configurations by solving the Tolman- Oppenheimer- Volkoff equations and obtain for the transition from a hot, normal quark matter core of a protoneutron star to a cool diquark condensed one a release of binding energy of the order of Delta M c^2 ~ 10^{53} erg. We find that this energy could not serve as an engine for explosive phenomena since the phase transition is not first order. Contrary to naive expectations the mass defect increases when for a given temperature we neglect the possibility of diquark condensation.
"Oztas A. M.
Blaschke David
Fredriksson Sverker
Grigorian Hovik
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