Neutron Star Properties and Femtoscopic Constraints
I. Vidana, V. Mantovani Sarti, J. Haidenbauer, D. L. Mihaylov, L. Fabbietti
arXiv:2412.12729v1 Announce Type: cross
Abstract: We construct the equation of state of hypernuclear matter and study the structure of neutron stars employing a chiral hyperon-nucleon interaction of the J”{u}lich–Bonn group tuned to femtoscopic $Lambda p$ data of the ALICE collaboration, and $LambdaLambda$ and $Xi$N interactions determined from Lattice QCD calculations by the HAL QCD collaboration that reproduce the femtoscopic $LambdaLambda$ and $Xi^-p$ data. We employ the ab-initio microscopic Brueckner–Hartree–Fock theory extended to the strange baryon sector. A special focus is put on the uncertainties of the hyperon interactions and how they are effectively propagated to the composition, equation of state, and mass-radius relation of neutron stars. To such end, we consider the uncertainty due to the experimental error of the femtoscopic $Lambda p$ data used to fix the chiral hyperon-nucleon interaction and the theoretical uncertainty, estimated from the residual cut-off dependence of this interaction. We find that the final maximum mass of a neutron star with hyperons is in the range $1.3-1.4$ $M_odot$, in agreement with previous works. The hyperon puzzle, therefore, remains still an open issue if only two-body hyperon-nucleon and hyperon-hyperon interactions are considered.arXiv:2412.12729v1 Announce Type: cross
Abstract: We construct the equation of state of hypernuclear matter and study the structure of neutron stars employing a chiral hyperon-nucleon interaction of the J”{u}lich–Bonn group tuned to femtoscopic $Lambda p$ data of the ALICE collaboration, and $LambdaLambda$ and $Xi$N interactions determined from Lattice QCD calculations by the HAL QCD collaboration that reproduce the femtoscopic $LambdaLambda$ and $Xi^-p$ data. We employ the ab-initio microscopic Brueckner–Hartree–Fock theory extended to the strange baryon sector. A special focus is put on the uncertainties of the hyperon interactions and how they are effectively propagated to the composition, equation of state, and mass-radius relation of neutron stars. To such end, we consider the uncertainty due to the experimental error of the femtoscopic $Lambda p$ data used to fix the chiral hyperon-nucleon interaction and the theoretical uncertainty, estimated from the residual cut-off dependence of this interaction. We find that the final maximum mass of a neutron star with hyperons is in the range $1.3-1.4$ $M_odot$, in agreement with previous works. The hyperon puzzle, therefore, remains still an open issue if only two-body hyperon-nucleon and hyperon-hyperon interactions are considered.