Charged quark stars in $f(R,T)$ gravity

Abstract

Recent advances in nuclear theory combined with new astrophysical observations have led to the need for specific theoretical models that actually apply to phenomena on dense-matter physics. At the same time, quantum chromodynamics (QCD) predicts the existence of non-nucleonic degrees of freedom at high densities in neutron-star matter, such as quark matter. Within a confining quark matter model, which consists of homogeneous, neutral 3-flavor interacting quark matter with $\mathcal{O}(m_s^4)$ corrections, we study the structure of compact stars made of a charged perfect fluid in the context of $f(R,T)$ gravity. The system of differential equations that describe the structure of charged compact stars have been derived and solved numerically for a gravity model with $f(R,T)=R+2\beta T$. For simplicity, we assume that the charge density is proportional to the energy density, namely, ${\rho }_{\mathrm{ch}}=\alpha \rho$. It is demonstrated that matter-geometry coupling constant $\beta$ and the charge parameter $\alpha$ affect the total gravitational mass and the radius of the star.

10 pages, 6 figures. To appear in Chinese Physics C

References in corpus (12)

• Unified cosmic history in modified gravity: from F(R) theory to Lorentz non-invariant models
• f(R,T) gravity
• Modelling wormholes in $f(R,T)$ gravity
• Generalized energy conditions in Extended Theories of Gravity
• Compact stars in $f(R,T)$ gravity
• Nonperturbative models of quark stars in $f(R)$ gravity
• Electrically Charged Strange Quark Stars
• Violation of First Law of Thermodynamics in f(R,T) Gravity
• Quantum Cosmology of $f(R,T)$ gravity
• Thermodynamic Behavior of particular $f(R,T)$ Gravity Models
• Non-radial Oscillation Modes of Compact Stars with a Crust
• Anisotropic quark stars in $f(R)=R^{1+\epsilon }$ gravity

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• Dynamical reconstruction of the $\Lambda$CDM model in scalar-tensor $f(R,T)$ gravity
• Moment of inertia and compactness of quark stars within the context of $f(R,T,L_m)$ gravity
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• The Reconstruction of Constant Jerk Parameter with $f(R,T)$ Gravity in Bianchi-I spacetime
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• Constraint on the equation of state of strange quark star: Perturbative QCD along with a density-dependent bag constant
• Charged anisotropic white dwarfs in $f\left(R,T\right)$ gravity