In an interview with David Freeman at The Huffington Post. Following up on “Why Neil deGrasse Tyson cannot replace Carl Sagan” (because the point of view Sagan stands for has been superseded), Freeman’s interview is titled “Why Revive ‘Cosmos?’ Neil DeGrasse Tyson Says Just About Everything We Know Has Changed”:
DF: And our conception of the cosmos may also have changed. Do you think we live in a universe–or a multiverse?
NT: We have excellent theoretical and philosophical reasons to think we live in a multiverse.
DF: Why is that?
NT: Quantum physics, which is the physics of the small, behaves in odd ways. Everything that the tenets of quantum physics predict about the universe–we go out and test it and it’s there. General relativity, which was put forth by Einstein, is the theory of the large–gravity and the large-scale structure of the universe. That also works. Yet they don’t work with one another. If you take the universe all the way back to the Big Bang, well, the entire universe was really small. So now you take the shotgun wedding–quantum physics and general relativity. In that shotgun wedding, if you follow through with all the predictions quantum physics gives you, it allows multiple bubbles to form–one of which is our universe. These are sorts of fluctuations in the quantum foam. Quantum physics fluctuates all the time. But now the fluctuations are not just particles coming into and out of existence, which happens all the time. It’s whole universes coming into and out of existence.
DF: And philosophically?
NT: Philosophically, the universe has really never made things in ones. The Earth is special and everything else is different? No, we’ve got seven other planets. The sun? No, the sun is one of those dots in the night sky. The Milky Way? No, it’s one of a hundred billion galaxies. And the universe–maybe it’s countless other universes.
DF: And our multiverse could be just one of many?
NT: Exactly. It might be that the multiverse is not alone.
These don’t strike yer humble news hack as exceptionally good arguments for a multiverse. What do physicist readers make of them?
For the way in which cosmology has now become fantasy, not fact, see The Science Fictions series at your fingertips (cosmology).
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