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Quark stars are a bit like neutron stars, they have very large masses and small radii. Can we detect gravitational waves emitted in a binary of two quark stars or the gravitational waves from a not perfectly round quark star which is rotating? If it is possible, could LIGO detect it or is it on another frequency? How could the detectors see the difference between quark stars and neutron stars?

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  • $\begingroup$ Quark stars are hypothetical in nature, though on the grounds of the question, it could be detected, though I can't say how strong would the gravitational waves be. $\endgroup$ – Orion 73 Apr 15 '20 at 12:07
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Quark stars, if they exist, would emit gravitational waves in a similar manner as neutron stars. In fact, their gravitational wave signals would be almost identical to that of a pair of merging neutron stars. The different composition of the objects would only express itself in differences in the tidal deformability, which would lead to a small but potentially measurable difference in the gravitational waveform (especially close to merger).

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  • $\begingroup$ Why are quark stars are more 'fluid', why do they have a greater tidal deformability then neutron stars? What does that deformability change in the gravitational waves? $\endgroup$ – BOB Apr 15 '20 at 13:31
  • $\begingroup$ I'm not saying that the tidal deform-ability would be greater, I'm saying it would be different. (Intuitively I would expect quark stars to be harder to deform.) The mutual tidal deform-ability of the stars leads to extra gravitational interactions between the stars. Consequently, the orbit evolves at a different rate, leading the gravitational waves to be slightly out of phase relative to a similar mass neutron star. This same principle is used in LIGO to try to learn about the behaviour of neutron star interiors. $\endgroup$ – mmeent Apr 15 '20 at 14:09
  • $\begingroup$ And how does LIGO learn about the interiors of the neutron stars? $\endgroup$ – BOB Apr 15 '20 at 16:32

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