spacetime - What happened during the Planck Era of the Big Bang?

If you look at a big bang timeline before 10 to the -43 seconds you can see

Planck time - ????

So I googled it and was met with

Before 1 Planck Time Before a time classified as a Planck time, 10-43 seconds, all of the four fundamental forces are presumed to have been unified into one force. All matter, energy, space and time are presumed to have exploded outward from the original singularity. Nothing is known of this period.

I looked at another timeline and instead of "Planck Era" it said "Quantum Fluctuation"

So any ideas of what was going on during that time period? Did Higgs Boson fields sweep through the known universe?

Answer

The Planck length $\ell_p~=~\sqrt{G\hbar/c^3}$ is related to the Planck time by $T_p~=~\ell/c$, or the time it takes a photon to cross this distance. The Planck length may be the shortest distance one can isolate a qubit. As a result the universe at the Planck time, assuming it occupied then a single Planck length, can only be said to consist of at most one state or vacuum, or a qubit in a single state. Now use Shannon information $S~=~-k\sum_np(n)log(p(n))$, and we have only $p(1)~=~1$ for one qubit. As a result $S~=~0$, or equivalently there is no real information. This is assuming the Planck moment of the universe was where the universe occupied a single Planck volume.

In a sense we can then say that during the Planck time at the start of the universe, or the observable universe potentially in a multiverse, there was in fact as close to nothing as one gets in physics. It also means we can't really say much about that epoch of the universe. If at the first Planck moment there were a number of Planck volumes or areas on a horizon, these might define some sphere packing for a group or symmetry. If so, say the $248$ root vectors of $E_8$ or the $256$ of $CL(8)$, these might define a sort of sphere packing system for the fundamental symmetry of the universe.