# The infinitely dense point from which the universe allegedly originated - the universe must expand, right? [duplicate]

## Assertions

• The big bang theory is currently accepted theory about the origin of the universe
• Infinitely dense implies some kind of material (I avoid the term matter intentionally) - think of it as the fabric the universe is made of (irrelevant what it is at its core)

## Question

If the point was indeed infinitely dense it would suggest that it never runs out of whatever that material is that defines its density, right?

From that viewpoint it would seem to be logical that the universe will keep expanding and expanding as the ("spatial") origin never runs out of the material the universe is made of, right?

So doesn't the big bang theory as it stands imply the ever-expanding universe outcome?

I wonder, because there is still no consensus about it in the scientific community, it seems.

## Remarks

Now I am aware that the physics of the beginning of the universe is theoretical and oftentimes beyond comprehension, in short: mind-boggling. This is why I came up with that question.

I'm just wondering whether one cannot automatically deduce one (ever-expanding universe) from the other (infinitely dense point at origin of universe)?

Or is my fallacy the one that the infinitely dense point refers not to the fact that the amount of material $x$ at that point is $\infty$, but rather because the space of a point is $0$? So because of that it doesn't matter whether $x = \infty$ at all? ...

## marked as duplicate by Jon Custer, Buzz, ZeroTheHero, stafusa, sammy gerbilDec 28 '18 at 12:36

• I can't claim to know enough about cosmology to give you anything close to a definite answer, but I was going to point out what you write in your last paragraph: Just because a density $n=\frac{x}{y}$ approaches infinity in some limit, you cannot conclude that $x$ approaches infinity in that limit. So your initial assumption is flawed. – RQM Feb 12 '15 at 15:11
• @RQM: yeah well, that's the thing with stuff like $\infty$ I guess. It sounds like an absolute value, when it's not. And yet, infinitely dense suggests there is no end to the density. – 0xC0000022L Feb 12 '15 at 17:58