# Strangeness in Nuclei and in Neutron Stars

May 20 – 21, 2015
Dipartimento di Fisica, Universita di Pisa
Europe/Rome timezone

## The hyperonic three-body forces in hadronic matter

May 20, 2015, 5:00 PM
30m
N. 131, building C (Dipartimento di Fisica, Universita di Pisa)

### N. 131, building C

#### Dipartimento di Fisica, Universita` di Pisa

Largo Bruno Pontecorvo, 3, Pisa (Italy)

### Speaker

Dr Domenico Logoteta (INFN section of Pisa)

### Description

We calculate a two-meson exchange three-baryon potential between two nucleons and one hyperon (NNY). Our NNY potential is built in order to be consistent with the two-body nucleon-hyperon (NY) Julich 2004 (Ju04) potential of the Julich 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 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 Domenico Logoteta (INFN section of Pisa)

 Slides