Speaker
Dr
Isaac Vidana
(University of Coimbra)
Description
We construct two-meson exchange three-baryon potentials between two
nucleons and one hyperon (NNY). Our NNY potentials are built in order
to be consistent with the most recent version of the two-body
nucleon- hyperon (NY) potential of the Juelich group. In particular,
we focus on the NNΛ and NNΣ forces since the Λ and Σ− are the first
hyperons expected to appear in microscopic calculations of neutron star
matter. We provide the explicit expressions for the various potentials
in r-space in such a way that they can be used both in finite hypernuclei
as well as hyperonic matter calculations. We finally discuss several
calculations of hyperonic matter, based on the Brueckner–Hartree–Fock
approach, including the effect of the hyperonic three-body forces.
These results suggest that at high densities the total contribution
of the NNY force is repulsive making the resulting equation of state (EoS)
stiffer, as required from neutron star mass observations.
Primary author
Dr
Isaac Vidana
(University of Coimbra)
