Mass-radius relation, moment of inertia, and tidal love numbers of anisotropic neutron stars in f (R,T) gravity

Abstract

The mass-radius relation, moment of inertia, and tidal love numbers of anisotropic neutron stars (NSs) have been investigated in $f(R,T)$ gravity by imposing two equations of state (EoS). We use the simplest form $f(R,T)=R+2\beta T$ model and adopt the anisotropy approach called Horvat model. To examine the viability of our calculations, we utilize the constraints from GW170817 and GW190814 observations. Moreover, we consider three values of $\beta$, i.e. $\beta =0$, $\beta =-0.01$, $\beta =-0.02$ and four anisotropy parameters $\alpha$, i.e. $\alpha =-0.12$, $\alpha =-0.06$, $\alpha =0.06$, $\alpha =0.12$. Our findings suggest that all physical quantities depend on both parameters $\alpha$ and $\beta$. Nevertheless, the impact of $\alpha$ is much more significant than $\beta$. The calculation of masses satisfy each used constraints for specific values of $\alpha$ and $\beta$. In the case of the moment of inertia, the results are compatible with the constraint obtained from radio observation of heavy pulsar. On the other hand, the tidal deformability of the NSs composed of one EoS satisfy the GW170817 constraint while the NSs composed of the other one EoS are too small. These small numbers can be interpreted as the property of secondary object observed in GW190814. As a result, our theoretical investigation of NSs constructed with two EoS can be NSs candidates for GW170817 and GW190814, respectively.

31 pages, 7 figures, accepted for publication in International Journal of Modern Physics D

References in corpus (44)

• GW170817: Observation of Gravitational Waves from a Binary Neutron Star Inspiral
• f(R,T) gravity
• PSR J0030+0451 Mass and Radius from NICER Data and Implications for the Properties of Neutron Star Matter
• Neutron Star Observations: Prognosis for Equation of State Constraints
• Tidal Love numbers of neutron stars
• Constraining neutron star tidal Love numbers with gravitational wave detectors
• Relativistic theory of tidal Love numbers
• Neutron-star radius constraints from GW170817 and future detections
• Nonparametric constraints on neutron star matter with existing and upcoming gravitational wave and pulsar observations
• Extreme neutron stars from Extended Theories of Gravity
• Stellar structure models in modified theories of gravity: lessons and challenges
• Magnetized Neutron Star Mergers and Gravitational Wave Signals
• On the Sound Speed in Neutron Stars
• Compact stars in $f(R,T)$ gravity
• Extended Gravity Description for the GW190814 Supermassive Neutron Star
• Radial pulsations and stability of anisotropic stars with quasi-local equation of state
• Slowly rotating neutron and strange stars in $R^2$ gravity
• GW190814 as a massive rapidly-rotating neutron star with exotic degrees of freedom
• Parameter estimation for binary neutron-star coalescences with realistic noise during the Advanced LIGO era
• Modified gravity inside astrophysical bodies
• Rapidly rotating neutron stars in $R$-squared gravity
• The possibility of the secondary object in GW190814 as a neutron star
• Neutron Star Mergers and How to Study Them
• The mass-radius relation for neutron stars in $f(R)=R+\alpha R^2$ gravity: a comparison between purely metric and torsion formulations
• Physical Model of Dust Polarization by Radiative Torque Alignment and Disruption and Implications for Grain Internal Structures
• $R^p$ Attractors Static Neutron Star Phenomenology
• Universal Inflationary Attractors Implications on Static Neutron Stars
• Inflationary Attractors Predictions for Static Neutron Stars in the Mass-Gap Region
• $I-$Love$-C$ relation for an anisotropic neutron star
• Neutron Stars in Scalar-tensor Gravity with Quartic Order Scalar Potential
• Moment of inertia of slowly rotating anisotropic neutron stars in $f(R,T)$ gravity
• Static Neutron Stars Perspective of Quadratic and Induced Inflationary Attractor Scalar-tensor Theories
• Probing internal dissipative processes of neutron stars with gravitational waves during the inspiral of neutron star binaries
• Tidal Love numbers of Proca stars
• Role of vector channel in different classes of (non) magnetized neutron stars
• Extended Tolman III and VII solutions in $f(\mathcal{R},T)$ gravity: Models for neutron stars and supermassive stars
• The I-Love-Q Relations for Superfluid Neutron Stars
• Uniqueness of the Inflationary Higgs Scalar for Neutron Stars and Failure of non-inflationary Approximations
• Slowly rotating anisotropic relativistic stars
• Implications of latest NICER data for the neutron star equation of state
• Tidal effects in gravitational waves from neutron stars in scalar-tensor theories of gravity
• Neutron Stars In $f(R,T)$ Theory: Slow Rotation Approximation
• Comparison of Burst Properties between FRB 20190520B and FRB 20121102A
• Rotational mass of anisotropic neutron stars within Rastall gravity