Hypernuclei and the hyperon problem in neutron stars

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.

9 pages, 8 figures

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Cited by in corpus (12)

• Relativistic Shapiro delay measurements of an extremely massive millisecond pulsar
• Hyperon-nucleon three-body forces and strangeness in neutron stars
• Scale-Invariant Hidden Local Symmetry, Topology Change and Dense Baryonic Matter II
• Hyperon Puzzle of Neutron Stars with Skyrme Force Models
• Can fermion-boson stars reconcile multi-messenger observations of compact stars?
• Scale-Invariant Hidden Local Symmetry, Topology Change and Dense Baryonic Matter
• Structure in the speed of sound: from neutron stars to heavy-ion collisions
• g-mode Oscillations in Neutron Stars with Hyperons
• Scalar Pseudo-Nambu-Goldstone Boson in Nuclei and Dense Nuclear Matter
• Cooling compact stars and phase transitions in dense QCD
• The EOS of neutron matter and the effect of $\Lambda$ hyperons to neutron star structure
• Why {\em Explicit} Strangeness Is Not Relevant In Compact Stars