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There’s a consensus among many physicists that the universe did not emerge from nothing, if fact stating that nothing simply cannot exist.
However while reading Carlo Rovelli book Quantum Gravity, the following on page 25 states:
So if we continue with this interpretation of fields building fields, do we have a picture of the universe which is built from nothing? Or something entirely different?
Hope I'm on the right track here.
However while reading Carlo Rovelli book Quantum Gravity, the following on page 25 states:
The space and time of Newton and Minkowski are reinterpreted as a configuration of one of the fields, the gravitational field. This implies that physical entities –particles and fields- are not all immersed in space, and moving in time. They do not live on spacetime. They live, so to say, on one another.
It is as if we had observed in the ocean many animals living on an island: animals on the island. Then we discover that the island itself is in fact a great whale. Not anymore animals on the island, just animals on animals. Similarly, the universe is not made by fields on spacetime; it is made by fields on fields. This book studies the far reaching effect that this conceptual shift has on QFT.
One consequence is that the quanta of the field cannot live in spacetime; they must build “spacetime” themselves. This is precisely what the quanta of space do in loop quantum gravity.
So if we continue with this interpretation of fields building fields, do we have a picture of the universe which is built from nothing? Or something entirely different?
Hope I'm on the right track here.