Rastall's gravity equations and Mach's Principle

Rational Orbits around Charged Black Holes

Ray optics in the field of non-minimal Dirac monopole

Ray-tracing and Interferometry in Schwarzschild Geometry

Ray-tracing in four and higher dimensional black holes: An analytical approximation

Raychaudhuri's equation and aspects of relativistic charged collapse

Re-examination of Polytropic Spheres in Palatini f(R) Gravity

Re-formulating the Einstein equations for stable numerical simulations: Formulation Problem in Numerical Relativity

Re-Scaling of Energy in the Stringy Charged Black Hole Solutions using Approximate Symmetries

Readings of the Lichnerowicz-York equation

Real and complex connections for canonical gravity

Real Ashtekar Variables for Lorentzian Signature Space-times

Real Formulations of Complex Gravity and a Complex Formulation of Real Gravity

Real null coframes in general relativity and GPS type coordinates

Real Scalar Field Scattering with Polynomial Approximation around Schwarzschild-de Sitter Black-hole

Real sector of the nonminimally coupled scalar field to self-dual gravity

Real Tunneling and Black Hole Creation

Real Tunneling Solutions and the Hartle-Hawking Wave Function

Realism And Empirical Evidence

Realistic Exact Solution for the Exterior Field of a Rotating Neutron Star