Robertson-Walker Metric

The Robertson-Walker metric is a mathematical model used in cosmology to describe the large-scale structure of the universe. It assumes the universe is uniform and the same in all directions (homogeneous and isotropic). This metric provides a way to measure distances and time in an expanding or contracting universe, incorporating a scale factor that changes over time. It forms the foundation for models of cosmic evolution, helping scientists understand how the universe expands and how its geometry affects the movement of galaxies and light across space.