Neutron star structure with nuclear force mediated by hypothetical X17 boson

Abstract

A reported $17$MeV boson, which has been proposed as an explanation to the ${}^8$Be and ${}^4$He anomaly, is investigated in the context of its possible influence to neutron stars structure. Implementing a $m_X$=17 MeV to the nuclear equation of state using different incompressibility values K${}_0$=245 MeV and K${}_0$=260 MeV and solving Tolman-Oppenheimer-Volkoff equations, we estimate an upper limit of $M_{TOV}\approx 2.4M\odot$ for a non rotating neutron star with span in radius $R$ between $11.5$km to $14$km. Moving away from pure - NN with admixture of 10\% protons and simulating possible softening of equation of state due to hyperons, we see that our estimated limits fit quite well inside the newest reported studies, coming from neutron stars merger event, GW190814

Comments: 5 pages, 4 figures, To appear in the EPJ Web of Conferences