What question did this study set out to answer?

This research aims to explore the properties of strange quark matter using the CIDDM model, specifically analyzing the impact of vector interactions.

May 19, 2026Open Access

Strange quark matter and quark stars in the confined-isospin-density-dependent-mass model with vector interactions

PCPeng-Cheng ChuQingdao University of Technology KLKe LiuQingdao University of Technology JWJiao-Jiao WangQingdao University of Technology

Key Points

This research aims to explore the properties of strange quark matter using the CIDDM model, specifically analyzing the impact of vector interactions.
Analyzed the equation of state and equivalent quark mass of strange quark matter at zero temperature.
Considered vector interactions within the CIDDM model to study their effects on quark stars.
Examined mass-radius relations in light of observed massive compact objects.
Including vector interactions significantly stiffens the equation of state, enhancing maximum mass of quark stars.
More massive quark stars exhibit smaller polytropic index and lower central baryon densities.
Findings align with observational constraints for various pulsars and compact objects.

Abstract

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.

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