The Big Bang: Inside a Singularity

[Imparcticle]

The big bang occurred after a singularity evaporated, correct? All that there was in the universe was "in" the singularity. So there was no space for the singularity to have curved.
Also, when space time is curved, in what direction is it curved? or is that relative to the observer?

 

[Nereid]

Taking just the first question: we *cannot* know, yet, even in principle, what happened in the first Planck time (~10^-43 sec), because our two most successful theories (QFT and GR) are inconsistent in this regime. This means, among other things, that we do not know if there was a singularity, or something else entirely. It also means that you and me and everyone else is free to speculate as much as we like about what happened; the only 'constraints' are that at the end of this period, our speculative universe is consistent with both QFT and GR.