1. Department of physics and ITPA, G.X.Peng(GUCAS/IHEP,Beijing)
Strange stars with
Different quark mass scalings
Li Ang (李昂)
Department of physics and ITPA,
Xiamen University
Collaborator:
R.X.Xu (PKU,Beijing)
G.X.Peng(GUCAS/IHEP,Beijing)
J.F.Lu(XMU,Xiamen)
May 20-24, 2009, Beijing

2. Motivation: BIG uncertainty of density dependence of Quark masses
Linear scaling: x = eg: Fowler et al. 1981,
Chakrabarty 1991;
Widely used; Pure phenomenological
Cubic scaling: x = 1/3 eg: Peng et al. 2000;
Developed recently; Based on quark chiral and linear confinement
Other forms eg: Dey et al. 1998,
Wang 2000,
Zhang & Su 2003.

3. Problem: FEW constrains from QCD

4. Aim: What extent this model allowed to study SQM
Where
x is treated as a FREE parameter (0.1-3)；
C is determined by stability arguments.
THAT is:

5. Formula of quark mass-density-dependent model
Strange quark matter
weak-equilibrium condition
charge-neutrality condition
the baryon number density
超流相
正常相

9. Equation of State of the SQM

10. Mass-radius relation of SSs
Using EOS as input, Solving Tolman-Oppenheimer-Volkov Eq.

11. Global properties of SSs

12. Surface electric field
Xu, R. X., et al. 2001

13. Thank you !