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Strange S tar or Neutron S tar EoS & Current Observation. Reporter: Long Jiang Nanjing University 2013 05 27. Outline. Introduction Why SQS Structure difference between NS and SQS E quation o f S tate MIT bag model Density dependent model by Dey - PowerPoint PPT Presentation
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Strange Star or Neutron StarEoS & Current Observation
Reporter: Long Jiang
Nanjing University 2013 05 27
Outline
• Introduction Why SQS Structure difference between NS and SQS • Equation of State MIT bag model Density dependent model by Dey • Models discussion and my present work Candidates of SQS My recent work
Introduction
• SQM stable than nuclei ~10^15 g/cm^3
Structure description
Equation of State: p=?
R. R. Silbar, S. Reddy, 2004, Am. J. Phys. 72,892
EoS -1: MIT bag Model
• Consider quark-gluon coupling:
• Massless-quark without Q-G coupling:
Chapline &Nauenberg 1977, Phys.Rev.D16,450
EoS-2: Density dependent: Dey
Part 1. Density dependent quark mass:
M. Dey et al. Phys.Lett.B438, 123(1998)
Part 2.Interquark potential:
Pair creation & infrared divergence -- Screening length:
J. L. Richardson, Phys.Lett.B 82(1979)272
Screening length
• Simplify with:
V. Baluni Phys. Rev. D17(1978) 2092
Conditions
• Charge neutrality:
• β-equilibrium
Chemical potential
Parameters
T. Gangopadhyay et al.arXiv:1303.1956
Present Observation
D. Leahy et al. ApJ 672, 1119(2008) S. Guillot et al. arXiv: 1302.0023
Data-Model consistence analysis
a
b
c
天文数据处理方法 P133
Example of model-Fitting
Some results as examples
Input r - + m - +
M28 10.6 1.58 0.45 1.17 0.34 0.31
NGC6304 9.4 1.45 1.45 1.12 0.31 0.31
4U1820-30 9.1 0.4 0.4 1.58 0.06 0.06
Output M28 NGC6304 4U1820-30
Dey2013 14304/9998 11581/10000 514/10000
BBB1 29093/9998 27376/10000 2002/10000
Thank you !!