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I am unclear as to whether "expansion of space can be rephrased as "expansion of volume" and whether that makes a difference.
How can you relate this to conservation of energy?
Could a white hole be the cause of the original big bang?
Einstein’s equations establish that white holes are mathematically possible; so this idea is on a better footing than, for example, the magic unicorn poking a hole in spacetime, thus causing a universe to appear. However, let’s not forget that there are many examples of things that “exist” mathematically, but may not, or do not exist in the physical world.
What causes quantum fluctuations in space to appear out of no where
Nobody has ever witnessed quantum fluctuations. They are inferred from other phenomena. They can be used to explain why other things might happen. The problem is that you can include them in endless speculation. That isn't scientific.
What is that something?
Could white holes, in creating space, account for the apparent, accelerating expanding universe today?
Could the quantum fluctuations existing throughout all of space be a result of a white hole, and explain the HUP?
Could the expansion of space be attributed to a white hole emitting energy in an additional dimension all around us today?
Is the multiverse concept better explained by adding additional dimensions to space time.
Could Energy escape from a Black Hole and reappear via another dimension as a White hole and drive the expansion of space.?
Does everyone accept there are additional dimensions? IF NOT WHY NOT?
Prior to the BB space time did not exist,
could an ER bridge be another dimension which does not require space time.
We know that, how?
I've not read this yet, but it may contain something of value.https://www.space.com/20881-wormholes.html