Massive neutron star rules out exotic matter

[wolram]

This is an article in newscientist.

http://space.newscientist.com/article/dn9428-massive-neutron-star-rules-out-exotic-matter.html

Exotic states of matter such as free quarks do not arise inside neutron stars, according to a new analysis of one of the super-dense stellar corpses. The result contradicts previous theories and offers an unprecedented view into the behaviour of matter under extreme pressure.

 

[Chronos]

A variety of effects appear to conspire to prevent the formation of quark stars. It casts doubts on the ability to form stellar mass black holes from core collapse events. I suspect SM black holes can only form from inspiraling binary neutron stars. This is a fairly rare event and would nicely explain why so few candidates are apparent.