The ringing wormholes
The river model of black holes
The Robertson-Walker Metric in a Pseudo-Complex General Relativity
The Robinson-Trautman Type III Prolongation Structure Contains K$_2$
The robustness of a many-body decoherence formula of Kay under changes in graininess and shape of the bodies
The rocket problem in general relativity
The role of anisotropy and inhomogeneity in Lemaitre-Tolman-Bondi collapse
The role of dilations in diffeomorphism covariant algebraic quantum field theory
The Role of Elliptic Operators in the Initial-Value Problem for General Relativity
The Role of Energy and a New Approach to Gravitational Waves in General Relativity
The role of Killing-Yano tensors in supersymmetric mechanics on a curved manifold
The role of observers in the measurement of the Teleparallel Gravitoelectromagnetic fields in different geometries
The role of pressure anisotropy on the maximum mass of cold compact stars
The role of shell crossing on the existence and stability of trapped matter shells in spherical inhomogeneous Λ-CDM models
The Role of the Apparent Horizon in the Evolution of Robinson-Trautman %%EINSTEIN-Maxwell Spacetimes
The role of the equation of state and the space-time dimension in spherical collapse
The role of the ergosphere in the Blandford-Znajek process
The Role of the Future in Quantum Theory
The role of the quantum properties of gravitational radiation in the dete ction of gravitational waves
The role of the time gauge in the 2nd order formalism