Influence of pressure anisotropy and non-metricity parameter on mass-radius relation and stability of millisecond pulsar in $f(Q)$ gravity

Abstract

In this study we explore the astrophysical implications of pressure anisotropy on the physical characteristics of millisecond pulsars within the framework of $f(Q)$ gravity, {in particular $f(Q)=-\alpha Q-\beta$, where $\alpha$ and $\beta$ are constants.} Starting off with the field equations for anisotropic matter configurations, we adopt the physically salient Durgapal-Fuloria ansatz together with a well-motivated anisotropic factor for the interior matter distribution. This leads to a nonlinear second order differential equation which is integrated to give the complete gravitational and thermodynamical properties of the stellar object. The resulting model is subjected to rigorous tests to ensure that it qualifies as a physically viable compact object within the $f(Q)$-gravity framework. We study in detail the impact of anisotropy on the mass, radius and stability of the star. Our analyses indicate that our models are well-behaved, singularity-free and can account for the existence of a wide range of observed pulsars with masses ranging from 2.08 to 2.67 $M_{\odot }$, with the upper value being in the so-called {\em mass gap} regime observed in gravitational events such as GW190814. {A comparison of the so-called {\em Symmetric Teleparallel Equivalent to GR} (STEGR) models with classical General Relativity (GR) models reveal that the anisotropy parameter and the sign of $\beta$ impact on the predicted radii of pulsars. In particular, STEGR models have larger radii than their GR counterparts.

arXiv comment6 figures and 2 tables (Submssion for JCAP)

References in corpus (81)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• f(R) Theories Of Gravity
• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• Shapiro delay measurement of a two solar mass neutron star
• f(R) theories
• Multi-messenger Observations of a Binary Neutron Star Merger
• Introduction to Modified Gravity and Gravitational Alternative for Dark Energy
• Modified Gravity Theories on a Nutshell: Inflation, Bounce and Late-time Evolution
• GW170817: Measurements of Neutron Star Radii and Equation of State
• 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
• Neutron Star Structure and the Equation of State
• 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
• Refined Mass and Geometric Measurements of the High-Mass PSR J0740+6620
• Coincident General Relativity
• The Nuclear Equation of State and Neutron Star Masses
• Baryons And Branes In Anti de Sitter Space
• Cosmology in $f(Q)$ geometry
• Anisotropic Stars in General Relativity
• Relativistic Mean-Field Theory and the High-Density Nuclear Equation of State
• Decoupling gravitational sources in general relativity: from perfect to anisotropic fluids
• A systematic approach to generalisations of General Relativity and their cosmological implications
• What if string theory has no de Sitter vacua?
• On the Mass Distribution and Birth Masses of Neutron Stars
• Decoupling gravitational sources in general relativity: the extended case
• On the Back Reaction Problem for Gravitational Perturbations
• Spin-Isospin Structure and Pion Condensation in Nucleon Matter
• Black holes with non-minimal derivative coupling
• Quantum Gravity Slows Inflation
• Charged anisotropic matter with linear or nonlinear equation of state
• Solar system constraints on f(T) gravity
• Asymptotically locally AdS and flat black holes in Horndeski theory
• Covariant formulation of f(Q) theory
• Stability of the isotropic pressure condition
• Extended Gravity Description for the GW190814 Supermassive Neutron Star
• Radial pulsations and stability of anisotropic stars with quasi-local equation of state
• Causal Limit of Neutron Star Maximum Mass in $f(R)$ Gravity in View of GW190814
• Comparing Equivalent Gravities: common features and differences
• Boson Stars in AdS
• Neutron stars in general second order scalar-tensor theory: the case of non-minimal derivative coupling
• Solutions in the scalar-tensor theory with nonminimal derivative coupling
• Slowly rotating neutron stars in the nonminimal derivative coupling sector of Horndeski gravity
• Strange stars in $f(R,\mathcal{T})$ gravity
• PSR J1810+1744: Companion Darkening and a Precise High Neutron Star Mass
• Trace-anomaly driven inflation in $f(T)$ gravity and in minimal massive bigravity
• Transport processes in anisotropic gravitational collapse
• Karmarkar scalar condition
• Living on the edge: cosmology on the boundary of anti-de Sitter space
• Physical Characteristics and Maximum Allowable Mass of Hybrid Star in the Context of $f(Q)$ Gravity
• The role of the boundary term in $f(Q,B)$ symmetric teleparallel gravity
• Emergent de Sitter Cosmology from Decaying AdS
• Boson stars with negative cosmological constant
• A pulsar in a binary with a compact object in the mass gap between neutron stars and black holes
• Charged Galileon black holes
• Study on charged strange stars in $f\left(R,\mathcal{T}\right)$ gravity
• Neutron stars with hyperon cores: stellar radii and EOS near nuclear density
• Neutron stars in Horndeski gravity
• Exploring physical properties of minimally deformed strange star model and constraints on maximum mass limit in $f(\mathcal{Q})$ gravity
• Atmospheric Circulation on Black Widow Companions
• Equation of state for neutron stars with hyperons by the variational method
• On the viability of $f(Q)$ gravity models
• Generalized teleparallel cosmology and initial singularity crossing
• Spherically Symmetric Solutions on a Non-Trivial Frame in f(T) Theories of Gravity
• Strong decays of $T_{c\bar{s}0}(2900{)}^{++/0}$ as a fully open-flavor tetraquark state
• Supermassive Neutron Stars in Axion $F(R)$ Gravity
• Compact objects in Horndeski gravity
• ADM formulation and Hamiltonian analysis of $f(Q)$ gravity
• A 350-MHz GBT Survey of 50 Faint Fermi Gamma-ray Sources for Radio Millisecond Pulsars
• Anisotropic compact stars in higher-order curvature theory
• Axial quasinormal modes of static neutron stars in the nonminimal derivative coupling sector of Horndeski gravity: spectrum and universal relations for realistic equations of state
• Charged Compact Boson Stars and Shells in the Presence of a Cosmological Constant
• Time Machines Constructed from Anti-de Sitter Space
• Stability of charged solitons and formation of boson stars in 5-dimensional Anti-de Sitter space-time
• Extremal Surfaces in Asymptotically AdS Charged Boson Stars Backgrounds
• De Sitter bubbles from anti-de Sitter fluctuations
• Spinning gauged boson stars in anti-de Sitter spacetime
• Q-stars in anti de Sitter spacetime
• Standard Cosmology on the Anti-de Sitter boundary
• Anti-de Sitter neutron stars in the theory of gravity with nonminimal derivative coupling
• Charged and radially excited boson stars (in Anti-de Sitter)

Cited by in corpus (1)

• Neutron stars in $f(\mathbb{Q})$ gravity