Rapidly rotating neutron stars in $f(R,T)$ gravity

Abstract

In this work, we study the influence of $f(R,T)$ gravity on rapidly rotating neutron stars. First we discuss the main aspects of this modified theory of gravity where the gravitational Lagrangian is an arbitrary function of the Ricci scalar $R$ and of the trace of the energy-momentum tensor $T$. Then we present the basic equations for neutron stars including the equations of state used in the present work to describe the hadronic matter. Some physical quantities of interest are calculated such as mass-radius relations, moments of inertia, angular momentum, and compactness. By considering four different rotation regimes, we obtain results that indicate substantial modifications in the physical properties of neutron stars in $f(R,T)$ gravity when compared to those in the context of general relativity. In particular, the mass-radius relation for sequences of stars indicates that $f(R,T)$ gravity increases the mass and the equatorial radius of the neutron stars for stars rotating with an angular velocity smaller than Kepler limit.

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Cited by in corpus (11)

• Quasi-static evolution of axially and reflection symmetric large-scale configuration
• Neutron stars in $f(R,L_m,T)$ gravity
• Observational constraints on the equation of state of viscous fluid in $f(R,T)$ gravity
• Constraining the $f(R,T)=R+2\lambda T$ cosmological model using recent observational data
• The first variation of the matter energy-momentum tensor with respect to the metric, and its implications on modified gravity theories
• Dynamical reconstruction of the $\Lambda$CDM model in scalar-tensor $f(R,T)$ gravity
• Extending Finch-Skea Isotropic Model to Anisotropic Domain in Modified $f(\mathcal{R},\mathcal{T})$ Gravity
• Neutron Stars In $f(R,T)$ Theory: Slow Rotation Approximation
• Ridges in rotating neutron-star properties due to first order phase transitions
• Growth of cosmic perturbations in the modified $f(R,T)$ gravity
• Black hole solutions surrounded by anisotropic fluid in f(T,T) gravity