The effect of inclusion of $\Delta$ resonances in relativistic mean-field model with scaled hadron masses and coupling constants

Abstract

Knowledge of the equation of state of the baryon matter plays a decisive role in the description of neutron stars. With an increase of the baryon density the filling of Fermi seas of hyperons and $\Delta$ isobars becomes possible. Their inclusion into standard relativistic mean-field models results in a strong softening of the equation of state and a lowering of the maximum neutron star mass below the measured values. We extend a relativistic mean-field model with scaled hadron masses and coupling constants developed in our previous works and take into account now not only hyperons but also the $\Delta$ isobars. We analyze available empirical information to put constraints on coupling constants of $\Delta$s to mesonic mean fields. We show that the resulting equation of state satisfies majority of presently known experimental constraints.

5 pages, 4 figures; Proceedings of the 2nd International Conference on Particle Physics and Astrophysics, Moscow, 10-14 October 2016

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Cited by in corpus (4)

• Properties of Hybrid Stars with Density Dependent Bag Model
• Variation of delta baryon mass and hybrid star properties in static and rotating conditions
• Deconfinement of non-strange hadronic matter with nucleons and $\Delta$ baryons to quark matter in neutron stars
• Role of $\Delta$s in determining the properties of Neutron Stars in parameterized hydrostatic equilibrium