• A. Öztas
  • D. Blaschke
  • S. Fredriksson
  • H. Grigorian
Conference paper
Part of the NATO Science Series II: Mathematics, Physics and Chemistry book series (NAII, volume 197)


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 form-factors 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 β- 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 ΔMc 2 ~ 1053 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.


Quark Matter Compact Star Mass Defect Quark Star Current Quark Mass 
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Copyright information

© Springer 2006

Authors and Affiliations

  • A. Öztas
    • 1
  • D. Blaschke
    • 2
  • S. Fredriksson
    • 3
  • H. Grigorian
    • 4
    • 5
  1. 1.Department of PhysicsHacettepe UniversityAnkaraTurkey
  2. 2.Fachbereich PhysikUniversität RostockRostockGermany
  3. 3.Department of PhysicsLuleaa University of TechnologyLuleaaSweden
  4. 4.Fachbereich PhysikUniversität RostockRostockGermany
  5. 5.Department of PhysicsYerevan State UniversityYerevanArmenia

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