Quark Matter May Not Be Strange.

  title={Quark Matter May Not Be Strange.},
  author={Bob Holdom and Jing Ren and Chen Zhang},
  journal={Physical review letters},
  volume={120 22},
If quark matter is energetically favored over nuclear matter at zero temperature and pressure, then it has long been expected to take the form of strange quark matter (SQM), with comparable amounts of u, d, and s quarks. The possibility of quark matter with only u and d quarks (udQM) is usually dismissed because of the observed stability of ordinary nuclei. However, we find that udQM generally has lower bulk energy per baryon than normal nuclei and SQM. This emerges in a phenomenological model… 

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