U-spin symmetry energy and hyperon puzzle in-admixed neutron stars
The study introduces a U-spin symmetry energy, EU(nb), to characterize binding energy variation in hyperonic matter. It finds that EU(nb) is much smaller than Esym(nb), suggesting weaker proton-neutron attraction relative to nucleon-hyperon pairs. This implies a potential well depth of -30 MeV, indicating a high probability for Λ hyperons to emerge in neutron stars.