Hypernuclei and the hyperon problem in neutron stars

TL;DR

This paper investigates the hyperon problem in neutron stars, showing that repulsive interactions of $\\Lambda$ particles at high densities are necessary to explain observed massive neutron stars.

Contribution

It provides a phenomenological analysis linking hypernuclei data and dense matter interactions to the hyperon problem in neutron stars.

Findings

$\\Lambda$ interactions must become repulsive below 3 times nuclear saturation density

Analysis connects hypernuclei data with dense matter properties

Highlights uncertainties in dense matter interactions

Abstract

The likely presence of $\Lambda$ baryons in dense hadronic matter tends to soften the equation of state to an extend that the observed heaviest neutron stars are difficult to explain. We analyze this "hyperon problem" with a phenomenological approach. First, we review what can be learned about the interaction of $\Lambda$ particle with dense matter from the observed hypernuclei and extend this phenomenological analysis to asymmetric matter. We add to this the current knowledge on non-strange dense matter, including its uncertainties, to conclude that the interaction between $\Lambda$s and dense matter has to become repulsive at densities below three times the nuclear saturation density.