Physicists model more than one million equations of state to uncover other previously unexplained properties of neutron stars. Through extensive model calculations, physicists at Goethe University Frankfurt have reached general conclusions about the internal structure of neutron stars, where matter
The study of the sound speed has revealed that heavy neutron stars have a stiff mantle and a soft core, while light neutron stars have a soft mantle and a stiff core – much like different chocolate pralines. Credit: Peter Kiefer & Luciano Rezzolla
Neutron stars are extremely compact objects that can form after the death of a star. They have the mass of our sun or even more, but are incredibly compressed into a sphere with the diameter of a large city. Since their discovery more than 60 years ago, scientists have been trying to decipher their structure. Thus far, however, little is known about the interior of neutron stars.
When evaluating the equations of state, the working group made a surprising discovery: “Light” neutron stars seem to have a soft mantle and a stiff core, whereas “heavy” neutron stars instead have a stiff mantle and a soft core.
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