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Quark confinement mechanism and QCD phase transition

Quark confinement mechanism and QCD phase transition. G.X.Peng 彭光雄 gxpeng@gucas.ac.cn. GUCAS & IHEP, Chinese Academy of Sciences. National Natural Science Foundation Committee of China. Conefinement by Density-dependent quark masses (CDDM) Comparison with the bag mechanism

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Quark confinement mechanism and QCD phase transition

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  1. Quark confinement mechanism and QCD phase transition G.X.Peng彭光雄 gxpeng@gucas.ac.cn GUCAS &IHEP, Chinese Academy of Sciences National Natural Science Foundation Committee of China Conefinement by Density-dependent quark masses (CDDM) Comparison with the bag mechanism 3. EoS of quark matter in CDDM 4. EoS of nuclear matter in Breuckner theory 4. Some preliminary results Ref: PRC 77(2008)065807; 72(2005)015204; 62(2000)025801;61(2000) 015201

  2. More stable: nuclear or quark matter?

  3. Quark confinement mechanism MIT bag CDDM

  4. Drawback of bag model (I) Sound velosity not zero for massless quarks

  5. Drawback of bag model (II): EoS always concave

  6. Confinement by density-dependent quark masses CDDM

  7. History 1. Fowler, Raha, Weiner suggested Z. Phys. C 9 (1981) 271 2. Chakrabarty, Raha, Sinha extended it to include strange quarks Phys. Lett. B 229 (1989) 112 Phys. Rev. D 43 (1991) 627; 48 (1993) 1409 3. Zhang and Su et. al. extended it to include temperature Europhys. Lett. 56 (2001) 361; Phys. Rev. C 67 (2003) 015202.

  8. Main weakpoints of the previous treatment • The quark mass scaling is not derived • The vacuum limits are incorrect • There are thermodynamic problems PRD 51 (1995) 1989, PRD 52 (1995) 1276

  9. Confinement by density-dependent quark masses

  10. Quark mass scaling

  11. Quark mass scaling Z=1/3, T=150—170 MeV

  12. Thermodynamic consistency Peng et al, PRC 77 (2008) 065807

  13. Schematic comparison (I)

  14. Schematic comparison (II)

  15. EoS of quark matter at finite density and temperature

  16. Transition from nuclear to quark matter (II) nm qm

  17. Gibbs Conditions 吉布斯条件

  18. Conservations 守衡律 1. Electric charge =0 2. Baryon number

  19. Nuclear EOS in the Brueckner theory with three-body forces

  20. The pressure

  21. The energy density

  22. Phase diagram at zero temperature

  23. Structure of compact stars

  24. Critical densities for given proton fractions 道可道，非常道，名可名，非常名。无名，天地之始；有名，万物之母。故常无，欲以观其妙；常有，欲以观其徼。此两者，同出而异名，同谓之玄；玄之又玄，众妙之门。

  25. Isentropic evolution of QGP 道可道，非常道，名可名，非常名。无名，天地之始；有名，万物之母。故常无，欲以观其妙；常有，欲以观其徼。此两者，同出而异名，同谓之玄；玄之又玄，众妙之门。

  26. Properties of strangelets 道可道，非常道，名可名，非常名。无名，天地之始；有名，万物之母。故常无，欲以观其妙；常有，欲以观其徼。此两者，同出而异名，同谓之玄；玄之又玄，众妙之门。

  27. Summary We have provided a new approach to consider quark confinement. It is applied to investigating the QCD Phase transition, the evolution of a QGO, the stracture of compact stars, and prperties of strangelets, etc. 道可道，非常道，名可名，非常名。无名，天地之始；有名，万物之母。故常无，欲以观其妙；常有，欲以观其徼。此两者，同出而异名，同谓之玄；玄之又玄，众妙之门。

  28. Thanks

  29. 再见

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