Why is there something rather than nothing.
The answer to that question must lie in the identification of the causality.
My picture of a pre-universe is a “timeless, dimensionless, permittive condition”, without any properties at all. And therein lies the answer of causality.
This perspective is based on the law of “necessity and sufficiency”
An empty permittive condition of nothing “needs” filling with something, just like a vacuum demands to be filled with air, and that condition represents a differential equation that is a causal dynamic.
In a timeless infinity, any disturbance represents a “beginning” such as the “inflationary epoch” when universal time began.
So it can be said that a timeless, dimensionless condition “demands” to be filled and, there must have been an instant collapse prior and causal to the inflationary epoch of pure energy transmuting into plasma and eventually into matter.
Nothing requires something and that is how the Universe began.