Estimation of the effect of hyperonic three-body forces on the maximum mass of neutron stars
Centro de Física Computacional, Department of Physics, University of Coimbra PT-3004-516, Coimbra, Portugal, EU
2 Departament d'Estructura i Constituents de la Matèria and Institut de Ciències del Cosmos, Universitat de Barcelona - Avda. Diagonal 647, E-08028 Barcelona, Spain, EU
3 Dipartimento di Fisica “E. Fermi”, Università di Pisa, and INFN, Sezione di Pisa Largo B. Pontecorvo 3, I-56127 Pisa, Italy, EU
Accepted: 2 March 2011
A model based on a microscopic Brueckner-Hartree-Fock approach of hyperonic matter supplemented with additional simple phenomenological density-dependent contact terms is employed to estimate the effect of hyperonic three-body forces on the maximum mass of neutron stars. Our results show that although hyperonic three-body forces can reconcile the maximum mass of hyperonic stars with the current limit of 1.4–1.5 M⊙, they are unable to provide the repulsion needed to make the maximum mass compatible with the observation of massive neutron stars, such as the recent measurements of the unusually high masses of the millisecond pulsars PSR J1614-2230 (1.97±0.04 M⊙) and PSR J1903+0327 (1.667±0.021 M⊙).
PACS: 13.75.Ev – Hyperon-nucleon interactions / 26.60.Kp – Equations of state of neutron-star matter / 26.60.-c – Nuclear matter aspects of neutron stars
© EPLA, 2011