Role of local anisotropy in hybrid stars

Abstract

Using the Bower-Liang model, we discuss how pressure anisotropies affect the microscopic and macroscopic properties of hybrid stars. We find that anisotropies affect the maximum mass, central density, and radius of the canonical stars. Anisotropies also affect the minimum neutron star mass that presents quarks in their core, as well as the total amount of quarks for the maximally massive stars. We also confront our results with standard constraints, such as the radius and the tidal parameter of the canonical star, as well as the mass and radius of the PSR J0740+6620 pulsar. We observe that moderate values for anisotropies could fulfill these constraints simultaneously. On the other hand, within more extreme degrees of anisotropies, more speculative constraints such as black widow pulsars PSR J0952-0607 and the mass-gap object in the GW190814 event can be explained as hybrid stars. We also investigate the role of anisotropies in the neutron stars' moment of inertia.

12 pages + Appendix

References in corpus (28)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation
• Tidal Love numbers of neutron stars
• PSR J0952-0607: The Fastest and Heaviest Known Galactic Neutron Star
• Relativistic effective interaction for nuclei, giant resonances, and neutron stars
• Astrophysical Constraints on the Symmetry Energy and the Neutron Skin of ${}^{208}$Pb with Minimal Modeling Assumptions
• Non-radial oscillations of anisotropic neutron stars in the Cowling approximation
• Inferring neutron star properties from GW170817 with universal relations
• Dark matter admixed neutron star as a possible compact component in the GW190814 merger event
• What is the nature of the HESS J1731-347 compact object?
• The tidal deformability of an anisotropic compact star: Implications of GW170817
• Phase transitions in dense matter and the maximum mass of neutron stars
• Equilibrium, radial stability and non-adiabatic gravitational collapse of anisotropic neutron stars
• Modified MIT Bag Models -- part II: QCD phase diagram and hot quark stars
• On the nature of the mass-gap object in the GW190814 event
• $I-$Love$-C$ relation for an anisotropic neutron star
• Quark Models and Radial Oscillations: Decoding the HESS J1731-347 Compact Object's Equation of State
• The baryon coupling scheme in an unified SU(3) and SU(6) symmetry formalism
• Anisotropic Strange Stars in the Spotlight: Unveiling Constraints through Observational Data
• Relativistic mean field model for ultra-compact low mass neutron star of HESS J1731-347
• BigApple force and its implications to finite nuclei and astrophysical objects
• Non-radial oscillations in anisotropic dark energy stars
• Imprints of the nuclear symmetry energy slope in gravitational wave signals emanating from neutron stars
• Decoding rotating neutron stars: Role of the symmetry energy slope
• Spherically symmetric anisotropic strange stars
• A closer look at the Yukawa's interaction from a symmetry group perspective

Cited by in corpus (2)

• Implications of Fermionic Dark Matter Interactions on Anisotropic Neutron Stars
• Gravitational-Wave Constraints on Neutron-Star Pressure Anisotropy via Universal Relations