Letter: How to think about zero or more multiverses (2)

From Philip Cunliffe, Bristol, UK

Daniel Cossins discusses two kinds of multiverse: inflationary and quantum. Both seem to assume that everything started with our one solitary big bang. That seems parochial, akin to this Earth being unique and at the centre of all things.

Is it not more conceivable that many big bangs have created many universes? Or, indeed, in an infinite void, that there have been infinitely many such happenings over an infinity of time?

Presumably different expanding universes might clash and, depending on the predominance of matter and antimatter from previous mixing, might annihilate each other or aggregate. This would result in a vast energy that eventually spawns another singularity, another universe. A consequence might be that an infinity of mixing would lead to something amazingly improbable: some universes would have an excess of matter over antimatter.