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.
Types of Q-stars
- SUSY Q-ball
- B-ball, stable Q-balls with a large baryon number B. They may exist in neutron stars that have absorbed Q-ball(s).
- Black hole
- Compact star
- 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.
- Abramowicz, M. A.; Kluźniak, W.; Lasota, J.-P. (2002). "No observational proof of the black-hole event-horizon". Astronomy & Astrophysics 396 (3): L31–L34. doi:10.1051/0004-6361:20021645. Bibcode: 2002A&A...396L..31A.
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