Abstract
We present the equation of state (EOS) of quark-diquark matter in the quark mass-density-dependent model. The region of the 2-D parameter space inside which this quark-diquark matter is stable against diquark disassembling and hadronization is determined. Motivated by observational data suggesting a high compactness of some neutron stars (NS) we present models based on the present EOS and compare the results with those obtained with previous works addressing a quark-diquark composition based on the MIT Bag model. We show that very compact self-bound stars (yet having ≥ 1M⊙) are allowed by our EOS even if the diquark itself is unbound.
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