I have read that the Big Bang created space-time, but how could this be possible? The Big Bang was itself a singularity, and a singularity is a point in space-time where the curvature becomes infinite. So how could the Big Bang create something without which its existence would not have been possible?
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4$\begingroup$ I'm voting to close this question as off-topic because it really belongs on Physics (although it is probably a dupe of a few there) $\endgroup$– Rory AlsopCommented Sep 17, 2018 at 15:44
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$\begingroup$ The models can't predict what were in the Planck epoch ($10^{-43} s$ "after" the Big Bang). This singularity is a model whose domain start after the Planck epoch. Maybe the string theory... $\endgroup$– peterhCommented Sep 17, 2018 at 17:00
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3$\begingroup$ Going backwards on the semi-axis of positive real numbers, we can approach the number zero as much as we like, without ever touching it. However, zero is not a strictly positive number, per se. Furthermore, $f(x)=1/x~$ is not defined in zero, since its value there would be infinity, which, as any self-respecting mathematician will tell you, is not a number. Indeed, zero is the infimum rather than the minimum of all positive reals. $\endgroup$– LucianCommented Sep 17, 2018 at 19:13
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$\begingroup$ I've voted for this question to be reopened - see meta discussion $\endgroup$– Chappo Hasn't ForgottenCommented Sep 28, 2018 at 22:16
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2 Answers
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It is impossible to measure anything that happened in the Planck Era, so physicists are unsure whether the universe actually began from a singularity or whether the singularity in the Big Bang theory represents an inability to describe the universe at that time. In fact, "Most physicists believe that this is a mathematical artefact and does not describe what actually happened."
It would be more accurate to say that the Big Bang is the beginning of space-time, than that it "created" space-time.
The Big Bang is a description of how the universe evolved in its earliest stages, not exactly a resolution to why the universe came to be. The latter is really a question for philosophy, not something that can be addressed by science per se. Science informs our philosophy, but does not make philosophical claims.
answered Sep 17, 2018 at 15:51
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There are questions on this topic on Physics.SE, but they require a certain level of understanding of the subject matter. Your question has some incorrect assumptions around the Big Bang. One being the definition of singularity - in reality this singularity is a point where certain variables may tend toward infinity, meaning our mathematics breaks down.
And the creation of space-time doesn't require anything to cause it - in fact it specifically implies that in our universe nothing could cause it, as there was nothing before it (there was no before)
If I were you I'd visit Physics.SE and read one of the 700 questions over there on this topic.
answered Sep 17, 2018 at 15:44
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$\begingroup$ Rather than say "nothing could cause it", you should probably say something like "the big bang could have happened out of nothing". "Nothing could cause it" is too familiar a term that can cloud what you're saying. $\endgroup$– userLTKCommented Sep 17, 2018 at 16:34