Modelling a $2.5M_{\odot }$ Compact Star with Quark Matter

Abstract

The detection of an unexpected $\sim 2.5M_{\odot }$ component in the gravitational wave event GW190814 has puzzled the community of High-Energy astrophysicists, since in the absence of further information it is not clear whether this is the heaviest "neutron star" ever detected or either the lightest black hole known, of a kind absent in the local neighbourhood. We show in this work a few possibilities for a model of the former, in the framework of three different quark matter models with and without anisotropy in the interior pressure. As representatives of classes of "exotic" solutions, we show that even though the stellar sequences may reach this ballpark, it is difficult to fulfill simultaneously the constraint of the radius as measured by the NICER team for the pulsar PSR J0030+0451. Thus, and assuming both measurements stand, compact neutron stars can not be all made of self-bound quark matter, even within anisotropic solutions which boost the maximum mass well above the $\sim 2.5M_{\odot }$ figure. We also point out that a very massive compact star will limit the absolute maximum matter density in the present Universe to be less than 6 times the nuclear saturation value.

arXiv commentTo appear in IJMPD, references added

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Cited by in corpus (14)

• A light strange star in the remnant HESS J1731-347: minimal consistency checks
• Maximum mass of compact stars from gravitational wave events with finite-temperature equations of state
• Anisotropic quark stars in $R^2$ gravity
• Tidal deformability of strange stars and the GW170817 event
• Ultracompact hybrid stars consistent with multimessenger astrophysics
• Gravitational wave echoes from interacting quark stars
• $2.6M_{\odot }$ Compact Object and Neutron Stars within Eddington-Inspired Born-Infeld Theory of Gravity
• Implications of supermassive neutron stars for the form of the equation of state of hybrid stars
• Is the remnant of GW190425 a strange quark star?
• An Overview of Compact Star Populations and Some of Its Open Problems
• Rotating Hybrid Stars with Color-Flavor-Locked Quark Matter
• Compact stars in the Einstein dark energy model
• Relativistic stellar modeling with perfect fluid core and anisotropic envelope fluid
• Tidal Deformability of Quark Stars with Repulsive Interactions