Double-$\Lambda$ hypernuclei in the relativistic mean-field theory
  We study the properties of double-$\Lambda$ hypernuclei in the relativistic mean-field theory, which has been successfully used for the description of stable and unstable nuclei. With the meson-hyperon couplings determined by the experimental binding energies of single-$\Lambda$ hypernuclei, we present a self-consistent calculation of double-$\Lambda$ hypernuclei in the relativistic mean-field theory, and discuss the influence of hyperons on the nuclear core. The contribution of two mesons with dominant strange quark components (scalar $\sigma^*$ and vector $\phi$) to the $\Lambda\Lambda$ binding energy of double-$\Lambda$ hypernuclei is examined. 
H. Shen, F. Yang, and H. Toki