How does General Relativity relate to the Big Bang?

Question

Luke Allen · Accepted Answer

The Standard Model of Cosmology (popularly known as the Big Bang Model) is built on the fundamental assumption that gravitation as modelled by Einstein's General Relativity is a correct.

Since gravitation is the dominant force on cosmic scales, a model of gravitation is necessary for the construction of cosmological models. Einstein's model of gravitation, General Relativity, forms the basis of the Standard Model of Cosmology, also referred to as the Big Bang model. Because of its action-at-a-distance feature, the Newtonian Model of Gravitation precludes the construction of cosmological models; that is, unless the universe's mass is uniformly distributed and its extent is infinite in all directions, all masses will collapse to a point, rendering cosmological models impossible. The Standard Model of Cosmology is based on General Relativity, which described gravity in terms of the geometry of space-time and opened up the possibility of a dynamic universe that could be expanding or contracting, preventing the gravitational collapse of all matter to a single point.

Levi Acosta · Answer

undefined General Relativity is the mathematical framework for modeling the expansion and evolution of the early universe, as well as phenomena like cosmic inflation. Therefore, General Relativity is the theoretical basis for understanding the dynamics of the universe, including its origin and evolution according to the Big Bang model. The Big Bang theory holds that the universe began as a hot, dense singularity and has been expanding ever since. The predictions of General Relativity are consistent with the Big Bang theory.