Terzan 5 contains an unusually high number of the "recycled" or "millisecond" subtype of them, and when the rotation of these objects slows, their stiff crusts can cause starquakes.
Hyperons can appear in these objects by virtue of the beta condition and would soften their equation of state; those hyperons are also predicted to have double the normal matter density of these objects. Pion condensation can accelerate the cooling of these objects, which are described by a popular equation of state formulated by Akmal, Panharipande, and Ravenhall. The majority of the cooling for these objects is done by emitting neutrinos via the (*) Urca process. Terzan 5 contains an unusually high number of the "recycled" or "millisecond" subtype of them, and when the rotation of these objects slows, their stiff crusts can cause starquakes. These objects are subject to an upper bound of about 3 solar masses above which quark stars are predicted to exist, the Tolman-Oppenheimer-Volkoff limit. Pulsars are a type of, for 10 points, what superdense stellar objects composed entirely of a certain nucleon?
Hyperons can appear in these objects by virtue of the beta condition and would soften their equation of state; those hyperons are also predicted to have double the normal matter density of these objects.
neutron stars [accept pulsars before mentioned, antiprompt after; antiprompt on specific types like "magnetar" etc.]