Hyperon threshold and stellar radii

Abstract

We study how the $\Lambda$ hyperon threshold influences the radius of the canonical $1.4M_{\odot }$ neutron star in the light of the measurements found in the recent literature. We show that the onset of a new degree of freedom not only causes the well known reduction of the maximum mass, but also compacts the neutron stars with high central density. With the help of the strange mesons $\varphi$ and ${\sigma }^{\ast }$, we show that it is possible to simulate very compact neutron stars keeping realistic hyperon potentials, $U_{\Lambda }(n_0)=-28$ MeV and $U_{\Lambda }^{\Lambda }(n_0/5)$ in agreement with recents measurements. In the end we generalize these results showing that the onset of a yet not known dark matter particle with mass of 1.04 GeV is able to produce simultaneously a 2 $M_{\odot }$ neutron star and a canonical one with a radius of only 11.62 km.

New Version to Match the published one - 20 pages, 14 figures

References in corpus (11)

• Shapiro delay measurement of a two solar mass neutron star
• A Massive Pulsar in a Compact Relativistic Binary
• Constraints on neutron star radii based on chiral effective field theory interactions
• (No) neutron star maximum mass constraint from hypernuclei
• Too massive neutron stars: The role of dark matter?
• EoS for massive neutron stars
• Repulsive Vector Interaction in Three Flavor Magnetized Quark and Stellar Matter
• Compact bifluid hybrid stars: Hadronic Matter mixed with self-interacting fermionic Asymmetric Dark Matter
• The importance of the mixed phase in hybrid stars built with the Nambu-Jona-Lasinio model
• Effects of strong magnetic fields on the population of hyperon stars
• Effects of the Symmetry Energy and its Slope on Neutron Star Properties

Cited by in corpus (10)

• Consistent relativistic mean field models constrained by GW170817
• Combined Rastall and Rainbow theories of gravity with applications to neutron stars
• Impacts of dark matter on the $f$-mode oscillation of hyperon star
• Dark matter effects on hybrid star properties
• The baryon coupling scheme in an unified SU(3) and SU(6) symmetry formalism
• Heavy Magnetic Neutron Stars
• Hypermassive quark cores
• Role of vector channel in different classes of (non) magnetized neutron stars
• The neutron star inner crust: an empirical essay
• Hadron-quark phase transition: the QCD phase diagram and stellar conversion