We have developed a formalism for microscopic Brueckner-type calculations of dense nuclear matter that includes all types of baryon-baryon interactions and allows us to treat any asymmetry in the fractions of the different species (n, p, $\Lambda ,$ ${\Sigma }^{-},$ ${\Sigma }^0,$ ${\Sigma }^{+},$ ${\Xi }^{-},$ and ${\Xi }^0).\mathrm{}$ We present results for the different single-particle potentials, focusing on situations that can be relevant in future microscopic studies of beta-stable neutron star matter with strangeness. We find that both the hyperon-nucleon and hyperon-hyperon interactions play a non-negligible role in determining the chemical potentials of the different species.

• Received 10 September 1999

DOI:https://doi.org/10.1103/PhysRevC.61.025802