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• W2916866922 abstract "Rapidly and differentially rotating compact stars are believed to be formed in binary neutron star merger events, according to both numerical simulations and the multimessenger observation of GW170817. Questions that have not been answered by the observation of GW170817 and remain open are whether or not a phase transition of strong interaction could happen during a binary neutron star merger event that forms a differentially rotating strange star as a remnant as well as the possibility of having a binary strange star merger scenario. The lifetime and evolution of such a differentially rotating star is tightly related to the observations in the postmerger phase. Various studies on the maximum mass of differentially rotating neutron stars have been done in the past, most of which assume the so-called $j$-constant law as the rotation profile inside the star. In this paper, we extend the studies to a more realistic differential rotation law and concentrate on bare quark star models. Significant differences are found between differentially rotating strange stars and neutron stars, with both the $j$-const law and the new rotation profile model. A moderate differential rotation rate for neutron stars is found to be too large for strange stars, resulting in a rapid drop in the maximum mass as the differential rotation degree is increased further from $stackrel{^}{A}ensuremath{sim}2.0$, where $stackrel{^}{A}$ is a parameter characterizing the differential rotation rate for the $j$-const law. As a result, the maximum mass of a differentially rotating self-bound star drops below the uniformly rotating mass-shedding limit for a reasonable degree of differential rotation. The continuous transition to the toroidal sequence is also found to happen at a much smaller differential rotation rate and angular momentum than for neutron stars. In spite of those differences, $stackrel{^}{A}$-insensitive relation between the maximum mass for a given angular momentum is still found to hold, even for the new differential rotation law. Astrophysical consequences of these differences and how to distinguish between strange star and neutron star models with future observations are also discussed." @default.
• W2916866922 created "2019-03-02" @default.
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• W2916866922 date "2019-08-16" @default.
• W2916866922 modified "2023-10-16" @default.
• W2916866922 title "Differentially rotating strange star in general relativity" @default.
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• W2916866922 doi "https://doi.org/10.1103/physrevd.100.043015" @default.
• W2916866922 hasPublicationYear "2019" @default.
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