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We can now know everything that happened essentially to a fraction of a second after the event we call the big bang. Before that we have no information as time and space did not exist in our Universe prior to this event.
It is analogous to the event horizon of a black hole past which we cannot retrieve information. Beyond this event horizon our physics no longer hold.
So extrapolation fails.
It is a matter of conjecture that all the four known forces become indistinguishable from each other.
A vacuum even when perfect is seething with particles that spontaneously come into existance and then dissapear again. This can be measured see Casimir Effect. Dielectric of a vacuum. How can a perfect vacuum have a dielectric effect when there are no charged particles present?
Space and time have a texture related to the Heisenberg Uncertainty principle it is not continuously smooth.
Gravity's origins is the major unknown and it is hoped that finding the Higgs Boson with particle accelerators now under construction will solve this problem. If it is not found at the energy predicted then our current model is wrong and would have to be modified or totally rethought.
All that matters is more structures more experiments....
Bert
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