Abstract
We construct a new equation of state for the baryonic matter under an intense magnetic field within the framework of covariant density functional theory. The composition of matter includes hyperons as well as Δ-resonances. The extension of the nucleonic functional to the hypernuclear sector is constrained by the experimental data on Λ and Ξ-hypernuclei. We find that the equation of state stiffens with the inclusion of the magnetic field, which increases the maximum mass of neutron star compared to the non-magnetic case. In addition, the strangeness fraction in the matter is enhanced. Several observables, like the Dirac effective mass, particle abundances, etc. show typical oscillatory behavior as a function of the magnetic field and/or density which is traced back to the occupation pattern of Landau levels.
Highlights
Compact stars are the end products of stellar evolution that are produced in supernova explosions
We note that the predicted surface magnetic field values are Bs ≈ 5.6 × 1017 G
We have extended, for the first time, one of the standard approaches which is based on covariant density functional (CDF) theory with density-dependent couplings to the case of strongly magnetized matter
Summary
Compact stars are the end products of stellar evolution that are produced in supernova explosions. Recent observations of compact stars in a wide range of electromagnetic spectra and in gravitational waves motivate detailed microscopic studies of the interior matter, in particular, its EoS and composition. The last measurement, which is based on Shapiro delay, is so far the largest measured maximum mass with relatively small error bars and, sets a reliable lower bound on the maximum mass of a compact object Another recent observation of gravitational waves by the LIGO-Virgo Collaboration (the “GW190814”event) from a binary system of a black hole and light compact object companion sets the mass of the latter at 2.59+−00..0089. An interesting possibility is an appearance of ∆-resonances in compact stars, which has regained attention in recent years [40,41,42], after they have been neglected for a long time due to presumed high onset density of the order of 10 times the nuclear saturation density [43].
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