Lots of the terminology in this new paper's title and abstract which considered methods of doing subatomic physics calculations with established physical theories from the Standard Model of Particle Physics to determine the properties of neutron stars would be challenging for my audience, but the bottom line conclusion isn't:
[N]eutron stars do not have quark matter cores in the light of all current astrophysical data.
From here.
Thus, neutron stars probably really are just tightly packed neutrons, as hypothesized many decades ago, and not more exotic hypothetical kinds of condensed matter like "quark stars" or "boson stars".
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