Exotic Star - Preon Stars

Preon Stars

A preon star is a proposed type of compact star made of preons, a group of hypothetical subatomic particles. Preon stars would be expected to have huge densities, exceeding 1023 kg/m3. They may have greater densities than quark stars and neutron stars although they are smaller and lighter than white dwarfs and neutron stars. Preon stars could originate from supernova explosions or the big bang. Such objects could be detected in principle through gravitational lensing of gamma rays. Preon stars are a potential candidate for dark matter. However, current observations from particle accelerators speak against the existence of preons.

In general relativity, if the star collapses to a size smaller than its Schwarzschild radius, an event horizon will appear at that radius and the star will become a black hole. To avoid a collapse at its density, a preon star's radius would need to be less than about 40 m with mass less than about 0.013 solar masses.