Ramond-Ramond Fields in Orientifold Backgrounds and K-Theory

Relativistic Diffusion in Gödel's Universe

Relativistic eccentric anomalies.

Relativistic Processes and the Internal Structure of Neutron Stars

Relativistic quantum chaos in Robertson-Walker cosmologies.

Relativistic string model in a space-time of a constant curvature

Relativistic surface with maximal acceleration

Relativistic theory of gravity and a Brans-Dicke scalar field

Remarks on cosmological spacetimes and constant mean curvature surfaces

Remarks on the geometric quantization of the Kepler problem

Repulsive and attractive timelike singularities in vacuum cosmologies

Retarded and Advanced Electromagnetic Fields in Friedmann Universes

Rigid cosmology: A classical analysis

Rotating viscous-fluid cosmologies with scalar field and heat flux

Rotation does not enhance mixing in the mixmaster universe

Rotation in cosmology: Comments on ``Imparting rotation to a Bianchi type II space-time,'' by M. J. Rebouças and J. B. S. d'Olival [J. Math. Phys. 27, 417 (1986)] and similar papers

Rotation numbers of periodic orbits in the Hénon map

Second Order Supersymmetry Transformations in Quantum Mechanics

Second-order mixtures in relativistic Schrödinger theory

Selection rules for topology change