Cooling of neutron stars with hyperons

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Cooling, Equations Of State, Hyperons, Neutron Stars, Stellar Temperature, Black Body Radiation, Neutrinos, Surface Temperature, Temperature Measurement, X Rays

Scientific paper

Measurements associated with the pulsed emission from pulsars and X-ray binaries are sensitive to details of emission and accretion mechanisms and consequently, depend more upon the surface properties of neutron stars than their interior properties. Even where a dependence upon interior conditions can be established, this dependence is often masked by other considerations and typically involves just the overall M vs. R relation, which is not particularly sensitive to the detailed composition of the star. The possibility of detecting unpulsed blackbody X-rays from neutron star surfaces provides a more direct and fairly sensitive probe of interior conditions. Detecting such radiation allows a surface temperature to be established for the star (assuming a particular value for the radius) which, through solutions of the general relativistic heat transport equations in the crust, provides an estimate of the interior temperature. Because young neutron stars cool primarily by means of neutrino emission from the interior, the latter quantity is rather sensitive to the interior equation of state.

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