Neutron Star Cross-Section

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© Dany Page.

Current observations of neutron star masses suggest the existence of stars with a mass of order 2 solar masses. Such stars require a stiff equation of state for the neutron matter that makes up most of the star to be able to balance the attraction of gravity—and rules out the presence of exotic forms of matter (pion-kaon condensates, quark matter or core solids) in the core of any neutron star because at any mass its central density is less than the transition densities for these exotic phases. (Unit: 8)