Relativistic mean-field theory equation of state of neutron star matter and a Maxwellian phase transition to strange quark matter |
| |
Authors: | G B Alaverdyan |
| |
Institution: | (1) Erevan State University, Erevan, Armenia |
| |
Abstract: | The equation of state of neutron star matter is examined in terms of the relativistic mean-field theory, including a scalar-isovector
δ-meson effective field. The constants of the theory are determined numerically so that the empirically known characteristics
of symmetric nuclear matter are reproduced at the saturation density. The thermodynamic characteristics of both asymmetric
nucleonic matter and β-equilibrium hadron-electron npe-plasmas are studied. Assuming that the transition to strange quark
matter is an ordinary first-order phase transition described by Maxwell's rule, a detailed study is made of the variations
in the parameters of the phase transition owing to the presence of a δ-meson field. The quark phase is described using an
improved version of the bag model, in which interactions between quarks are accounted for in a one-gluon exchange approximation.
The characteristics of the phase transition are determined for various values of the bag parameter within the range B ∈ 60,120]MeV/fm3 and it is shown that including a δ-meson field leads to a reduction in the phase transition pressure P
0 and in the concentrations n
N
and n
Q
at the phase transition point.
Translated from Astrofizika, Vol. 52, No. 1, pp. 147–164 (February 2009). |
| |
Keywords: | (stars) neutron superdense matter equation of state quarks |
本文献已被 SpringerLink 等数据库收录! |
|