Ask Ethan: The Multiverse And The Road Not Traveled

“Go then, there are other worlds than these.” -Stephen King, The Dark Tower

When you think about the Multiverse, everyone thinks about the Universe beyond what's accessible to us. But whether you think about more Universe like our own, multiple Universe that are disconnected from ours, an infinite number of parallel Universes, where possibly multiple copies of identical "yous" are entangled, or where the laws of physics are different from our own depends on what type of Multiverse you're talking about.

Image credit: Bock et al. (2006, astro-ph/0604101); modifications by me. Image credit: Bock et al. (2006, astro-ph/0604101); modifications by me.

 

As it turns out, our standard picture of inflation, the Big Bang and quantum physics leads to some of these being quite likely, with others being grossly disfavored. Before you follow the speculations of a great many others down whatever rabbit-hole of thought they'd lead you, come learn about what's known, what's expected and what's highly speculative (and unobservable) based on our current knowledge.

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“It’s hard to build models of inflation that don’t lead to a multiverse. It’s not impossible, so I think there’s still certainly research that needs to be done.
We all have our own interpretation of what "the scientific method" is, but there's always at least one thing that they all have in common: the ultimate arbiter of whether a theory or idea is valid depends on the evidence that comes back from physically observable phenomena.
“Go then, there are other worlds than these.” -Stephen King, The Dark Tower
“My main interest is the problem of the singularity.

I would have to pass on the 'entanglement' aspect since I have no conscious connection to other lives in other places (universes).