The Friedmann-Lemaitre-Robertson-Walker Big Bang singularities are well behaved

Understand

We show that the Big Bang singularity of the Friedmann-Lemaitre-Robertson-Walker model does not raise major problems to General Relativity.

• We prove a theorem showing that the Einstein equation can be written in a non-singular form, which allows the extension of the spacetime before the Big Bang.
• The physical interpretation of the fields used is discussed.
• These results follow from our research on singular semi-Riemannian geometry and singular General Relativity.