On Massive Neutron Cores

It has been suggested that, when the pressure within stellar matter becomes high enough, a new phase consisting of neutrons will be formed. In this paper we study the gravitational equilibrium of masses of neutrons, using the equation of state for a cold Fermi gas, and general relativity. For masses under \frac{1}{3}\ensuremath{\bigodot}only one equilibrium solution exists, which is approximately described by the nonrelativistic Fermi...