Does GR really post-dict the big bang?

[PerpStudent]

Do the GR tensor equations have specific solutions that post-dict the big bang? I have seen references to GR providing a theoretical basis for the big bang. Exactly what is the nature of this theoretical basis? If the mathematics for this is too complex for posting on this forum, I would appreciate a link that would provide more information about this. Thanks in advance.

 

[phyzguy]

Yes, there is a solution to the Einstein field equations that describes the big-bang. It is called the Friedmann–Lemaître–Robertson–Walker metric, and it's not really that complicated. Here's a link to get started. It reduces to a set of simple ordinary differential equations called the Friedmann equations.

 

[PerpStudent]

Thank you. That's very helpful.