Kavli Affiliate: Renxin Xu
| Summary:
The fact that strange sea quarks are abundant in the nucleons, but with zero net strangeness, is of great importance for understanding the nature of matter condensed by the strong interaction, particularly in the context of the “gigantic nucleus” formed by the gravitational collapse of an evolved massive star. We hypothesize that the basic unit of bulk strong matter with the light-flavor symmetry of valence quarks is “strangeon”, which is the counterpart of the nucleon found in atomic nuclei. In addition to strangeon stars (SnSs) with large baryon number of $Aapprox 10^57$, strange nuggets (SnNs) with $Agtrsim 10^10$ could also exist in the Universe. Both the SnS and the SnN are explained, with attention to their observational evidence.
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