Regular Article - Theoretical Physics
Delta baryons in neutron-star matter under strong magnetic fields
Department of Physics, Kent State University, 44243, Kent, OH, USA
2 Depto de Física, CFM, Universidade Federal de Santa Catarina, CP. 476, 88040-900, Florianopolis, SC, Brazil
Accepted: 19 June 2021
Published online: 1 July 2021
In this work, we study magnetic field effects on neutron star matter containing the baryon octet and additional heavier spin 3/2 baryons (the ’s). We make use of two different relativistic hadronic models that contain an additional vector-isovector self interaction for the mesons: one version of a relativistic mean field (RMF) model and the chiral mean field (CMF) model. We find that both the additional interaction and a strong magnetic field enhance the baryon population in dense matter, while decreasing the relative density of hyperons. At the same time that the vector-isovector meson interaction modifies neutron-star masses very little (), it decreases their radii considerably, allowing both models to be in better agreement with observations. Together, these features indicate that magnetic neutron stars are likely to contain baryons in their interior.
© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2021