Randomly different initial conditions

Modern cosmology involves the idea of quantum genesis — tracing back the cosmic expansion to an origin in a singularity where the space that now contains 100 billion galaxies was smaller than an atom. The inflationary scenario is an adjustment of standard big bang to include an extremely early phase of exponential expansion. The idea was developed to explain why the universe now is very smooth and geometrically flat. Inflation has tentative support from the nature of small temperature variations in cosmic background radiation. If inflation is correct, the universe began as quantum fluctuation. The precursor state would have been an ensemble of quantum fluctuations, perhaps infinite in number, each with randomly different initial conditions. Some of them inflated into large space-times like our own. Others were still born. This process can be timeless and eternal.

Beyond: Our Future in Space by Chris Impey (2015)