General relativity, we are told, breaks down at the smallest scales, but does it necessarily hold good on a cosmic scale.

Non-local correlations can exist over cosmic distances and require collapse of the wave function to occur over such distances simultaneously with the measurement. At a minimum the notion of simultaneity requires a synchronous coordinate system for spacetime.

This does not sit well with relativity which militates against the concept of an absolute time frame.

There never was nothing.