Friedmann-Lemaître-Robertson-Walker (FLRW) Metric

The Friedmann-Lemaître-Robertson-Walker (FLRW) metric is a mathematical description used in cosmology to model the universe’s shape and expansion. It assumes the universe is homogeneous and isotropic, meaning it looks the same everywhere and in all directions on a large scale. This metric provides a way to understand how distances between galaxies change over time, capturing the idea that space itself is stretching. It forms the foundation for modern cosmology, helping scientists study the universe’s history, structure, and evolution within the framework of Einstein’s theory of general relativity.