Abstract We investigate the properties of strange quark matter (SQM) at zero temperature within the confined-isospin-density-dependent-mass (CIDDM) model by incorporating the vector interactions. The equation of state (EOS), equivalent quark mass, isospin asymmetry, and polytropic index of SQM are analyzed. We find that including the vector interactions can significantly stiffen the EOS, thereby enhancing the maximum mass of quark stars (QSs). Considering the vector interactions within CIDDM model, the mass-radius relation of QSs can describe the recent discovered massive compact object as QSs and can satisfy the observational constraint regions of PSR J0740+6620, 4U 1702−429, PSR J0030−0451, PSR J0437−4715, PSR J0614−3329, and HESS J1731−347. In particular, our results indicate that more massive QSs in this framework exhibit smaller polytropic index, lower central baryon densities, and lower central energy and central pressure of QSs.
Chu et al. (2026) studied this question.