Astronomy:Q star

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Short description: Hypothetical compact star
Not to be confused with Q* or quark star.
A simple diagram illustrating how some but not all light can escape from a grey hole

A Q-star, also known as a grey hole, is a hypothetical type of 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, can escape.[1] Light going in the opposite direction of the star’s center would be the most likely to escape from it, while light going in a direction almost parallel to its surface is the most likely not to escape. The Q stands for a conserved particle number. A Q-star may be mistaken for a stellar black hole.[2] Some stellar black holes might be grey holes, two of which are V404 Cygni and Cygnus X-1. [1]

Types of Q-stars

  • Q-ball[3]
  • B-ball, stable Q-balls with a large baryon number B. They may exist in neutron stars that have absorbed Q-ball(s).[3]

See also

References

  1. ↑ 1.0 1.1 Brecher, K. (1993-05-01). "Gray Holes". American Astronomical Society Meeting Abstracts #182 182: 55.07. Bibcode: 1993AAS...182.5507B. 
  2. ↑ *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. Bibcode: 1998MNRAS.294L..25M. 
  3. ↑ 3.0 3.1 Kusenko, Alexander (2006). "Properties and signatures of supersymmetric Q-balls". workshop on Exotic Physics with Neutrino Telescopes. Uppsala, Sweden. Bibcode: 2006hep.ph...12159K. 

Further reading




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