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Massive neutron stars and A-hypernuclei in relativistic mean field models

孙亭亭  夏铖君  张时声  M.S.Smith  
【摘要】:Based on relativistic mean field(RMF) models, we study finite A-hypernuclei and massive neutron stars. The effective N-N interactions PK1 and TM1 are adopted, while the N-A interactions are constrained by reproducing the binding energy of A-hyperon at 1 s orbit of_Λ~(40)Ca. It is found that the A-meson couplings follow a simple relation, indicating a fixed A potential well for symmetric nuclear matter at saturation densities, i.e., around V_Λ=-29.786 MeV. With those interactions, a large mass range of Λ-hypernuclei can be described well. Furthermore,the masses of PSR J1614-2230 and PSR J0348+0432 can be attained adopting the Λ-meson couplings g_(σΛ)/g_(σN)≥0.73,g_(ωΛ)/g_(ωN)≥0.80 for PK1 and g_(σΛ)/g_(σN)≥0.81,g_(ωΛ)/g_(ωN)≥0.90 for TM1, respectively. This resolves the hyperon puzzle without introducing any additional degrees of freedom.

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