The Big Bang (beginning) of the Big Bang (up and out) / Planck (down and in) / Infinite (collapsed Horizon is the White Hole Horizon of Universe, only non-local, non-relative, and so light loaded -- infinitely light-loaded -- it's 'dark'. It is the other side of the coin of Universe to the Black Hole Horizon. Not really two coins, but two sides and [virtually] two coins (as Hawking stated about the six-sided particle that each side of six sides is a particle and, therefore, six particles that are in fact also, singularly, just one particle), a naked singularity of coin (in this case, a naked singularity of "Horizon"). Non-Aristotelian, non-classical, quanta-universe logic raised to be the largest picture -- Big Bang stereotypical -- of all (and the smallest -- Planck stereotypical, too (the same picture)). You might think horizontal 2-dimensionally flat universe but add in vertical 2-dimensional universe that does not total four dimensions but is a multiplication of dimensions. The infinity of point-portals to the Horizon (the two Horizons, White and Black, both in fact 'dark', if you want to see it that way) projects a permanent, continuing constant, edge-universe size mural of all plural beginning as a singular Big Bang Beginning . . . like Hawking's many-sided, many-particle, [singularity] of particle. It is Alice in Wonderland / Through the Looking Glass / Quantum Mechanics' weirdness, type stuff at border horizon large and at border horizon small (the same horizon): the collapsed horizon (horizons) of infinity.
In the large picture of things, as in the small (again the same picture), forget the universe of Relativity, the too-local universe; the all-too-finitely relative, all-too-inconstant, universe.