Constraining hypernuclear density functional with $Λ$-hypernuclei and compact stars

E. N. E. van Dalen; Giuseppe Colucci; Armen Sedrakian

doi:10.1016/j.physletb.2014.06.002

paper

Constraining hypernuclear density functional with $Λ$ -hypernuclei and compact stars

arXiv:1406.0744 · doi:10.1016/j.physletb.2014.06.002

Abstract

We present a simultaneous calculation of heavy single- $Λ$ 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 $σ$ - $Λ$ and $σ$ - $Σ$ 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 $σ$ - $Λ$ coupling using the data on the single- $Λ$ hypernuclei and derive an upper bound on the $σ$ - $Σ$ from the requirement that the lower bound on the maximum mass of a compact star is $2 M_{⊙}$ .

10 pages, 4 figures, to appear in Phys. Lett. B, v2: minor editorial corrections

Constraining hypernuclear density functional with $Λ$ -hypernuclei and compact stars

Abstract

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Constraining hypernuclear density functional with Λ-hypernuclei and compact stars

Abstract

References in corpus (6)

Cited by in corpus (14)

Constraining hypernuclear density functional with $Λ$ -hypernuclei and compact stars