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The equation of state for neutron matter is calculated within relativisticHartree-Fock approximation. The tensor couplings of vector mesons to baryonsare included, and the change of baryon internal structure in matter is alsoconsidered using the quark-meson coupling model. We obtain the maximumneutron-star mass of $\sim 2.0 M_\odot$, which is consistent with the recentlyobserved, precise mass, $1.97\pm0.04 M_{\odot}$. The Fock contribution is veryimportant and, in particular, the inclusion of tensor coupling is vital toobtain such large mass. The baryon structure variation in matter also enhancesthe mass of a neutron star.

Effects of Fock term, tensor coupling and baryon structure variation on a neutron star