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Nuclear Theory, nucl-th, Astrophysics, High Energy Astrophysical Phenomena, astro-ph.HE
Abstract:
Inspired by various astrophysical phenomenons, it was suggested that
pulsar-like compact stars may in fact be strangeon stars, comprised entirely of
strangeons (quark-clusters with three-light-flavor symmetry) and a small amount
of electrons. To examine such possibilities, in this work we propose a linked
bag model, which can be adopted for strong condensed matter in both 2-flavoured
(nucleons) and 3-flavoured (hyperons, strangeons, etc.) scenarios. The model
parameters are calibrated to reproduce the saturation properties of nuclear
matter, which are later applied to hyperonic matter and strangeon matter. The
obtained energy per baryon of strangeon matter is reduced if we adopt larger
quark numbers inside a strangeon, which stiffens the equation of state and
consequently increases the maximum mass of strangeon stars. In a large
parameter space, the maximum mass and tidal deformability of strangeon stars
predicted in the linked bag model are consistent with the current astrophysical
constraints. It is found that the maximum mass of strangeon stars can be as
large as $\sim 2.5M_\odot$, while the tidal deformability of a $1.4M_\odot$
strangeon star lies in the range of $180\lesssim \Lambda_{1.4} \lesssim 340$.
More refined theoretical efforts as well as observational tests to these
results are necessary in the future.
