# Was the universe infinitely large immediately after the Big Bang?

**URL:** <https://boards.straightdope.com/t/was-the-universe-infinitely-large-immediately-after-the-big-bang/1008983>\
**Category:** Factual Questions\
**Created:** [October 19, 2024, 9:43pm UTC](https://boards.straightdope.com/t/was-the-universe-infinitely-large-immediately-after-the-big-bang/1008983 "2024-10-19T21:43:49Z")\
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**Author:** ![eschereal](https://sea3.discourse-cdn.com/straightdope/user_avatar/boards.straightdope.com/eschereal/32/18939_2.png) [@eschereal](https://boards.straightdope.com/u/eschereal)\
**Post date:** [November 10, 2024, 10:33pm UTC](https://boards.straightdope.com/t/was-the-universe-infinitely-large-immediately-after-the-big-bang/1008983/54 "2024-11-10T22:33:15Z")

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> [@DPRK](#):
>
> There are some classical results:  
> [general relativity - Can the universe's topology change during its evolution? - Physics Stack Exchange](https://physics.stackexchange.com/questions/662243/can-the-universes-topology-change-during-its-evolution)
> 
> > There are some classic results showing, on Lorentzian spacetime, topology changes violate causality (Geroch proved this in the '60s)

My question: is causality absolutely linear? If we can observe eventual vectors and anicipate a result, we adjust our behavior based upon the likely/inevitable event. The passage of time is a flow of information, which can identify future events in the present, so I have to wonder if causality vioation must be a deal breaker.

&nbsp;

> [@Mijin](#):
>
> there are overarching questions of how/why anything exists at all, and those are definitely in the “we don’t know” column. At this time it looks intractable and all current answers, whether scientific or religious, boil down to “A thing just existed”.

This was addressed in a book I read (cannot remember title or author) which involved reason murdering deities. The assertion was framed in the manner of nothing being in a perfect state of equillibrium, a state which is analogous to a bowling ball perfectly balanced on the tip of a spear: it is inherently unstable. Nothing diverged from its state in a natural way, thence becoming something. Nothing became something because that was the only possibility. Reality came to exist because it had to.

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