Lambda-CDM model

Summary

The Lambda-CDM model is the standard model of cosmology. It is a spatially flat Friedmann–Lemaître–Robertson–Walker universe containing a positive cosmological constant $\Lambda$, cold dark matter, ordinary matter and radiation. With a handful of parameters it fits the cosmic microwave background, the large-scale distribution of galaxies and the accelerated expansion seen in distant supernovae. Today about $70\%$ of its energy density is in $\Lambda$ and about $30\%$ in matter.