Effects of anisotropic pressure on interacting quark star structure

Abstract

Perturbative Quantum Chromodynamics (pQCD) corrections and color superconductivity predict that strongly interacting matter can reveal new physical phenomena under extreme conditions. Taking into account these interaction effects, we investigate the role of anisotropic pressure in quark stars composed of interacting quark matter. Adopting two physically well-motivated anisotropy profiles, we numerically solve the stellar structure equations in order to explore the consequences of anisotropic pressure on various macroscopic properties such as radius, gravitational mass, surface redshift, moment of inertia, tidal Love number and oscillation spectrum. Remarkably, for both anisotropy models, negative anisotropies increase the radial stability of interacting quark stars, while the opposite occurs for positive anisotropies. However, for the Bowers-Liang profile, the central density corresponding to the maximum-mass point does not coincide with the central density where the squared oscillation frequency vanishes, indicating that the existence of stable anisotropic interacting quark stars is possible beyond the maximum mass for negative anisotropies. Additionally, we compare our theoretical predictions with several observational mass-radius measurements and tidal deformability constraints, which suggest that both strong interaction effects and anisotropy effects play a crucial role in describing compact stars observed in the Universe.

arXiv comment17 pages, 17 figures and 1 table. To appear in Physics Letters B

References in corpus (30)

• Shapiro delay measurement of a two solar mass neutron star
• The Confrontation between General Relativity and Experiment
• A Massive Pulsar in a Compact Relativistic Binary
• 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
• Masses, Radii, and Equation of State of Neutron Stars
• A NICER View of the Massive Pulsar PSR J0740+6620 Informed by Radio Timing and XMM-Newton Spectroscopy
• Anisotropic Stars in General Relativity
• Tidal Love Numbers of Neutron and Self-Bound Quark Stars
• Peering into the dark side: magnesium lines establish a massive neutron star in PSR J2215+5135
• Neutron star tidal deformability and equation of state constraints
• Constraining the Mass and Radius of Neutron Stars in Globular Clusters
• Nonperturbative models of quark stars in $f(R)$ gravity
• Non-radial oscillations of anisotropic neutron stars in the Cowling approximation
• Analytical study of anisotropic compact star models
• Hybrid protoneutron stars with the MIT bag model
• Secondary component of gravitational-wave signal GW190814 as an anisotropic neutron star
• Equilibrium, radial stability and non-adiabatic gravitational collapse of anisotropic neutron stars
• Anisotropic neutron stars in $R^2$ gravity
• Speed of sound constraints from tidal deformability of neutron stars
• Generating static spherically symmetric anisotropic solutions of Einstein's equations from isotropic Newtonian solutions
• Anisotropic quark stars in $f(R)=R^{1+\epsilon }$ gravity
• Moment of inertia of slowly rotating anisotropic neutron stars in $f(R,T)$ gravity
• Radial pulsations, moment of inertia and tidal deformability of dark energy stars
• Study on anisotropic strange stars in $f(\mathbb{T},\mathcal{T})$ gravity
• Fluid pulsation modes and tidal deformability of anisotropic strange stars in light of the GW$170817$ event
• Relativistic structure of charged quark stars in energy-momentum squared gravity
• Non-radial oscillations and global stellar properties of anisotropic compact stars using realistic equations of state
• Quark cores in extensions of the MIT Bag model

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• Gravitational-Wave Constraints on Neutron-Star Pressure Anisotropy via Universal Relations