Hyperon puzzle and the RMF model with scaled hadron masses and coupling constants

Abstract

The equation of state of cold baryonic matter is studied within a relativistic mean-field model with hadron masses and coupling constants depending on a scalar field. We demonstrate that if the effective nucleon mass stops to decrease with a density increase at densities $n>n_{\ast }>n_0$, where $n_0$ is the nuclear saturation density, the equation of state stiffens for these densities and the limiting neutron star mass increases. The stabilization of the nucleon mass can be realised if in the equation of motion for the scalar mean-field there appear a term sharply varying in a narrow vicinity of the field value corresponding to the density $n_{\ast }$. We show several possible realizations of this mechanism getting sufficiently stiff equations of state. The appearance of hyperons in dense neutron star interiors is accounted for. The obtained equations of state remain sufficiently stiff if the reduction of the $\varphi$ meson mass is incorporated. Thereby, the hyperon puzzle can be resolved.

6 pages, 3 figures; Proceedings of the Strangeness in Quark Matter 2015, Dubna, July 6-11, 2015

References in corpus (5)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Constraints on the high-density nuclear equation of state from the phenomenology of compact stars and heavy-ion collisions
• Solution of the Hyperon Puzzle within a Relativistic Mean-Field Model
• Making a soft relativistic mean-field equation of state stiffer at high density

Cited by in corpus (5)

• Kaon meson condensate in neutron star matter including hyperons
• g-mode Oscillations in Neutron Stars with Hyperons
• Kaon-meson condensation and $\Delta$ resonance in hyperonic stellar matter within a relativistic mean-field model
• Effects of Phi and ${\sigma }^{\ast }$-meson on properties of hyperon stars including $\Delta$ resonance
• Antikaon condensation in magnetized neutron star matter within the framework of the $\sigma$-cut scheme