Constraining hypernuclear density functional with Λ-hypernuclei andcompact stars

We present a simultaneous calculation of heavy single-Lambda hypernuclei and compact stars containing hypernuclear core within a relativistic density functional theory based on a Lagrangian which includes the hyperon octet and lightest isoscalar-isovector mesons which couple to baryons with density-dependent couplings. The corresponding density functional allows for SU(6) symmetry breaking and mixing in the isoscalar sector, whereby the departures in the sigma-Lambda and sigma-Sigma couplings away from their values implied by the SU(3) symmetric model are used to adjust the theory to the laboratory and astronomical data. We fix sigma-Lambda coupling using the data on the single-Lambda hypernuclei and derive an upper bound on the sigma-Sigma from the requirement that the lower bound on the maximum mass of a compact star is 2M(circle dot). (C) 2014 Elsevier B.V. This is an open access article under the CC BY license.