Strange quark stars in modified vector MIT bag model: role of $ρ$ and $ϕ$ mesons

Abstract

In the present work, we study the properties of strange quark stars (SQSs) using the vector MIT bag model with modification in vector channels. Unlike recent studies which only consider interactions through $ω$ mesons, we analyze the possibility of $ρ$ and $ϕ$ vector channels. We consider two types of higher order non-linear self-interaction terms for the vector mesons. With these modifications, we computed the equation of state (EoS) and mass-radius of strange stars for different values of vector coupling strength. Considerations of $ρ$ and $ϕ$ vector mesons along with $ω$, as well as an increase in the strength of vector coupling $g_v$, enhance the mass and radius of SQSs. For two kind of non-linear self-interactions of vector mesons considered in the present calculations, we observe the SQSs with maximum mass $2.48$ and $2.42 M_{\odot}$ for the vector coupling $g_v = 3$. Corresponding radii of these SQSs are found to be $12.27$ and $12.18$ km, respectively. We also calculate the tidal deformability parameter $Λ$, the Love number $k_2$ and the gravitational redshift of SQSs. The tidal deformability parameter $Λ$ is observed to increase with $g_v$, with appreciable effect for low mass stars.