Q star

A Q-star, also known as a grey hole, is a hypothetical type of a compact, heavy neutron star with an exotic state of matter. Such a star can be smaller than the progenitor star's Schwarzschild radius and have a gravitational pull so strong that some light, but not all light, cannot escape. The Q stands for a conserved particle number. A Q-star may be mistaken for a stellar black hole.[1]

Not to be confused with quark star.

Types of Q-stars
  • SUSY Q-ball[2]
  • B-ball, stable Q-balls with a large baryon number B. They may exist in neutron stars that have absorbed Q-ball(s).[2]

See also

References
  2. Kusenko, Alexander (2006). Properties and signatures of supersymmetric Q-balls. workshop on Exotic Physics with Neutrino Telescopes. Uppsala, Sweden. arXiv:hep-ph/0612159. Bibcode:2006hep.ph...12159K.}

Further reading
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