2010•Physical review. D. Particles, fields, gravitation, and cosmology/Physical review. D. Particles and fieldsOpen access

Astrophysical measurement of the equation of state of neutron star matter

Feryal Özel, Gordon Baym, Tolga Güver

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Abstract

We present the first astrophysical measurement of the pressure of cold matter above nuclear saturation density, based on recently determined masses and radii of three neutron stars. The pressure at higher densities is below the predictions of equations of state that account only for nucleonic degrees of freedom, and thus present a challenge to the microscopic theory of neutron star matter.

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Key concepts: Neutron star, Physics, Equation of state, Dense matter, Saturation (graph theory), Neutron, Nuclear matter, Nuclear physics