Anisotropic stars in 4 D Einstein–Gauss–Bonnet gravity

2021/09/01 by Takol Tangphati, Anirudh Pradhan, Ayan Banerjee +1
Physics and Astronomy · #Anisotropy #Black Holes and Theoretical Physics #Compact star #Context (archaeology) #Cosmology and Gravitation Theories #Degenerate energy levels #Equation of state #Fermi Gamma-ray Space Telescope #Pulsars and Gravitational Waves Research #Quark #Quark star #Stars #Strange matter #gr-qc

paper · pdf · doi:10.1016/j.dark.2021.100877

published as Physics of the Dark Universe 33 (2021) 100877 · 13 pages, 5 figures, version accepted for publication in Phys. Dark Univ

arxiv created 2021/09/01 · openalex publication_date 2021/09/01 · openalex created_date 2021/09/13 · arxiv updated 2021/09/15 · openalex updated_date 2026/08/05

Abstract

The current trend concerning dense matter physics at sufficiently high densities and low temperatures is expected to behave as a degenerate Fermi gas of quarks forming Cooper pairs, namely a color superconductor, in the core of compact objects. In this context, we study the anisotropy of quark stars (QSs) assuming the internal composition to be comprised of homogeneous, charge neutral 3-flavor interacting quark matter with O(m_s⁴) corrections. Using the equation of state (EoS) with the Tolmann-Oppenheimer-Volkoff (TOV) structure equations, we perform numerical calculation for quark stars and determine the maximum mass-radius relation in the context of 4D Einstein-Gauss-Bonnet (EGB) gravity. In particular, we consider the effects of Gauss-Bonnet (GB) coupling constant on the diagrams related to mass-radius (M-R) relation and the mass-central mass density (M-ρ_c) relation of QSs. We pay particular attention to the influence of the anisotropy in the equilibrium and stability of strange stars. We also study the other properties of QSs related to compactness and binding energy. Interestingly, our result provides circumstantial evidence in favor of super-massive pulsars in 4D EGB gravity.

Citations

• Absence of two-flavor color-superconductivity in compact stars
• SPHERICALLY SYMMETRIC GRAVITATIONAL COLLAPSE OF A DUST CLOUD IN EINSTEIN–GAUSS–BONNET GRAVITY
• Local anisotropy in self-gravitating systems
• The D to 2 limit of general relativity
• All static spherically symmetric anisotropic solutions of Einstein’s equations
• Second-order scalar-tensor field equations in a four-dimensional space
• A 2.1M⊙Pulsar Measured by Relativistic Orbital Decay
• A two-solar-mass neutron star measured using Shapiro delay
• Cosmic separation of phases
• Higher Order Gravity Theories and Their Black Hole Solutions
• A schematic model of baryons and mesons
• Nonradial oscillation modes of compact stars with a crust
• Role of pressure anisotropy on relativistic compact stars
• Anisotropic Quark Stars with an Interacting Quark Equation of State
• Einstein-Gauss-Bonnet gravity in 4-dimensional space-time
• Observational constraints on the regularized 4D Einstein-Gauss-Bonnet theory of gravity
• Quasinormal modes and strong cosmic censorship in the regularised 4D Einstein–Gauss–Bonnet gravity
• Equivalence of solutions between the four-dimensional novel and regularized EGB theories in a cylindrically symmetric spacetime
• Collapsed Nuclei