Reynolds numbers in the early Universe

Ricci focusing, shearing, and the expansion rate in an almost homogeneous Universe

Richness Dependence of the Recent Evolution of Clusters of Galaxies

Riding the wake of a merging galaxy cluster

Rigging dark halos: why is hierarchical galaxy formation consistent with the inside-out build-up of thin discs?

Rindler force at large distances

Ring galaxies from off-centre collisions

Ring-like features in directional dark matter detection

Rings and bars: unmasking secular evolution of galaxies

Rings and spirals in barred galaxies. II. Ring and spiral morphology

Rings and spirals in barred galaxies. III. Further comparisons and links to observations

Rip/singularity free cosmology models with bulk viscosity

Rms variability properties of the iron K alpha line in Seyfert galaxies

Robust constraints on dark energy and gravity from galaxy clustering data

Robust limit on a varying proton-to-electron mass ratio from a single H2 system

Robust Optical Richness Estimation with Reduced Scatter

Robustness to systematics for future dark energy probes

Rogues' gallery: the full freedom of the Bianchi CMB anomalies

Role of Galaxy Mergers in Cosmic Star Formation History

Role of Massive Radiation Pressure in the Early Universe