Rapidly rotating neutron stars in $R$-squared gravity

Abstract

$f(R)$ theories of gravity are one of the most popular alternative explanations for dark energy and therefore studying the possible astrophysical implications of these theories is an important task. In the present paper we make a substantial advance in this direction by considering rapidly rotating neutron stars in $R^2$ gravity. The results are obtained numerically and the method we use is non-perturbative and self-consistent. The neutron star properties, such as mass, radius and moment of inertia, are studied in detail and the results show that rotation magnifies the deviations from general relativity and the maximum mass and moment of inertia can reach very high values. This observation is similar to previous studies of rapidly rotating neutron stars in other alternative theories of gravity, such as the scalar-tensor theories, and it can potentially lead to strong astrophysical manifestations.

8 pages, 2 figures, 1 table

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Cited by in corpus (9)

• Anisotropic compact stars in $f(R)$ gravity
• Rapidly rotating neutron stars with a massive scalar field - structure and universal relations
• Radial oscillations and stability of compact stars in $f(R,T)=R+2\beta T$ gravity
• Neutron stars in Scalar-Tensor-Vector Gravity
• Oscillation modes of rapidly rotating neutron stars in scalar-tensor theories of gravity
• Structure of Compact Stars in R-squared Palatini Gravity
• Polar Quasinormal Modes of Neutron Stars in Massive Scalar-Tensor Theories
• Compact Objects in Alternative Gravities
• Role of $\Delta$s in determining the properties of Neutron Stars in parameterized hydrostatic equilibrium