2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/200367We consider the effect of hard core repulsion in the baryon-baryon interaction at short distance to the properties of a neutron star. We obtain that, even with hyperons in the interior of a neutron star, the neutron star mass can be as large as $\sim 2 M_\odot$.4 pages, 1 figure. A contribution to Yukawa International Seminar (YKIS) 2006, "New Frontiers in QCD", Kyoto, Japan, Nov. 20 - Dec. 8, 2006Nuclear Theorytext