Effects of isovector scalar meson on neutron star both with and without hyperon

摘要

We study the effects of isovector-scalar (delta)-meson on neutron and hyperon stars. Influence of delta-meson on both static and rotating stars is discussed. The delta-meson in a neutron star consisting of protons, neutrons and electrons, makes the equations of states (EOS) stiffer at higher density, and consequently increases the maximum mass of the star. But induction of delta-meson in the hyperon star decreases the maximum mass. This is due to the early evolution of hyperons in presence of delta-meson.