J4 ›› 2010, Vol. 45 ›› Issue (9): 96-100.

• Articles • Previous Articles     Next Articles

Effect of self-interactions on the transition density of hyperon stars

ZHAO Xian-feng1, ZHANG Hua2   

  1. 1. Department of Electronics Engineering, Chuzhou University, Chuzhou 239000, Anhui, China;
    2. Institute of Applied Physics and Computational Mathematics, Beijing100089, China
  • Received:2010-01-29 Online:2010-09-16 Published:2010-10-12

Abstract:

The effect of selfinteraction on the transition density of hyperon stars was examined in the framework of relativistic mean field theory for the baryon octet {n,p,Λ,Σ-0+-0}system. It was found that the transition density of hyperon stars increased compared with those without considering the contribution of self-interaction. The critical baryon density increased when the hyperons Σ0 and Σ+ appeared, but it decreased when the Λ,Ξ-,Σ- and Ξ0 appeared. For the transition density of hyperon stars, the hyperons Λ and Ξ- make a greater contribution to the hyperon number density, more than 80 percent. The presence of self-interaction makes the relative number density of Ξ-  and Ξ0 increase but that of Λ,Σ-,Σ0 and Σ+ decrease.

Key words: neutron star; hyperon star; transition density; relativistic mean field theory

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