Q star

Not to be confused with Q* or quark star.

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 photons, can 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

• Black hole
  • Stellar black hole
• Compact star
  • Exotic star
    • Boson star
    • Electroweak star
    • Preon star
    • Strange star
    • Quark star

References

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. arXiv: astro-ph/9708065 . Bibcode:1998MNRAS.294L..25M. doi: 10.1046/j.1365-8711.1998.01384.x .
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

• Abramowicz, M. A.; Kluźniak, W.; Lasota, J.-P. (2002). "No observational proof of the black-hole event-horizon". Astronomy & Astrophysics. 396 (3): L31 –L34. arXiv: astro-ph/0207270 . Bibcode:2002A&A...396L..31A. doi:10.1051/0004-6361:20021645. S2CID   9771972.