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quark star
A quark star is a hypothetical type of compact exotic star composed of quark matter. These are ultra-dense phases of degenerate matter theorized to form inside particularly massive neutron stars.
The existence of quark stars has not been confirmed theoretically or astronomically. The equation of state of quark matter is uncertain, as is the transition point between neutron-degenerate matter and quark matter. Theoretical uncertainties have precluded making predictions from first principles. Experimentally, the behaviour of quark matter is currently being actively studied with particle colliders, although this can only produce hot quark-gluon plasma blobs the size of an atomic nucleus, which decay immediately after formation. There are no known artificial methods to produce or store cold quark matter as it would be found in quark stars.
==Creation==
It is theorized that when the neutron-degenerate matter, which makes up neutron stars, is put under sufficient pressure from the star's own gravity or the initial supernova creating it, the individual neutrons break down into their constituent quarks (up quarks and down quarks), forming what is known as quark matter. This conversion might be confined to the neutron star's center or it might transform the entire star, depending on the physical circumstances.〔Shapiro and Teukolsky: ''Black Holes, White Dwarfs and Neutron Stars: The Physics of Compact Objects'', Wiley 2008〕 Such a star is known as a quark star.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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