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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Compact object | 3/3 | https://en.wikipedia.org/wiki/Compact_object | reference | science, encyclopedia | 2026-05-05T13:31:55.959127+00:00 | kb-cron |
Q stars are hypothetical compact, heavier neutron stars with an exotic state of matter where particle numbers are preserved with radii less than 1.5 times the corresponding Schwarzschild radius. Q stars are also called "gray holes".
=== Electroweak stars ===
An electroweak star is a theoretical type of exotic star, whereby the gravitational collapse of the star is prevented by radiation pressure resulting from electroweak burning, that is, the energy released by conversion of quarks to leptons through the electroweak force. This process occurs in a volume at the star's core approximately the size of an apple, containing about two Earth masses.
=== Boson star === A boson star is a hypothetical astronomical object that is formed out of particles called bosons (conventional stars are formed out of fermions). For this type of star to exist, there must be a stable type of boson with repulsive self-interaction. As of 2016 there is no significant evidence that such a star exists. However, it may become possible to detect them by the gravitational radiation emitted by a pair of co-orbiting boson stars.
== Compact relativistic objects and the generalized uncertainty principle == Based on the generalized uncertainty principle (GUP), proposed by some approaches to quantum gravity such as string theory and doubly special relativity, the effect of GUP on the thermodynamic properties of compact stars with two different components has been studied recently. Tawfik et al. noted that the existence of quantum gravity correction tends to resist the collapse of stars if the GUP parameter is taking values between Planck scale and electroweak scale. Comparing with other approaches, it was found that the radii of compact stars should be smaller and increasing energy decreases the radii of the compact stars.
== See also == Galaxy formation and evolution
== References ==
== Sources == Blaschke, D.; Fredriksson, S.; Grigorian, H.; Öztaş, A.; Sandin, F. (2005). "Phase diagram of three-flavor quark matter under compact star constraints". Physical Review D. 72 (6) 065020. arXiv:hep-ph/0503194. Bibcode:2005PhRvD..72f5020B. doi:10.1103/PhysRevD.72.065020. S2CID 119356279. Sandin, F. (2005). "Compact stars in the standard model – and beyond". European Physical Journal C. 40 (2): 15–22. arXiv:astro-ph/0410407. Bibcode:2005EPJC...40...15S. doi:10.1140/epjcd/s2005-03-003-y. S2CID 119495444.{{cite journal}}: CS1 maint: unflagged free DOI (link) Sandin, F. (2005). Exotic Phases of Matter in Compact Stars (PDF) (Thesis). Luleå University of Technology.