Astronomy:Q star

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Short description: Hypothetical compact 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.[citation needed] The Q stands for a conserved particle number. A Q-star may be mistaken for a stellar black hole.[1]

Types of Q-stars

  • 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


  1. *Miller, J. C.; Shahbaz, T.; Nolan, L. A. (1998). "Are Q-stars a serious threat for stellar-mass black hole candidates?". Monthly Notices of the Royal Astronomical Society 294 (2): L25–L29. doi:10.1046/j.1365-8711.1998.01384.x. Bibcode1998MNRAS.294L..25M. 
  2. 2.0 2.1 Kusenko, Alexander (2006). "Properties and signatures of supersymmetric Q-balls". workshop on Exotic Physics with Neutrino Telescopes. Uppsala, Sweden. }

Further reading