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- Title
KEPLERIAN FREQUENCY OF UNIFORMLY ROTATING NEUTRON STARS IN RELATIVISTIC MEAN FIELD THEORY.
- Authors
ZHANG, N. B.; QI, B.; WANG, S. Y.; GE, S. L.; SUN, B. Y.
- Abstract
Adopting the equation of states (EOSs) from the relativistic mean field (RMF) theory, the relationships among the keplerian frequency fK, gravitational mass M and radius R for the rapidly rotating neutron stars with and without hyperons are presented and analyzed. For various RMF EOSs, the empirical formula , proposed by P. Haensel et al. [ Astron. Astrophys. 502 (2009) 605], is found to be an approximation with the error at most 13% and such approximation is worse for the neutron stars with hyperons. It indicates that the errors should be considered when the empirical formula is used to discuss the properties of neutron stars.
- Subjects
MEAN field theory; HYPERONS; NEUTRON stars; EQUATIONS of state; GRAVITATIONAL mass; STELLAR rotation; LAGRANGE equations; DEGREES of freedom
- Publication
International Journal of Modern Physics E: Nuclear Physics, 2013, Vol 22, Issue 11, p-1
- ISSN
0218-3013
- Publication type
Article
- DOI
10.1142/S0218301313500857