Re: Asymptotic expansion of a flat universe
In article <1137628192.962405.86250@xxxxxxxxxxxxxxxxxxxxxxxxxxxx>, "David R Tribble" <david@xxxxxxxxxxx> writes:
>[This may sound like a stupid question, but...]
>
>Assuming that the critical density of the universe (Omega) is 1, the
>universe is flat and therefore will expand forever. My understanding
>is that this expansion is asymptotic, gradually slowing but never
>quite reaching zero.
>
>At the same time, current theories support the notion that there is
>a smallest quantum distance (on the order of the Planck scale),
>so that it is meaningless to discuss distances smaller than this.
No, there is no current theory supporting such notion.
>
>So given an expanding universe with a decreasing expansion rate,
>wouldn't it reach a point where it could not expand any further
>because the expansion distance from one moment to the next
>would be less than the quantum limit?
>
To answer questions involving an interplay of QM and gravity, we would
need a quantum theory of gravity. This is a subject of great interest
but we don't have such theory, yet.
Mati Meron | "When you argue with a fool,
meron@xxxxxxxxxxxxxxxxx | chances are he is doing just the same"
.
Relevant Pages
- Re: What if gravity isnt a force, just an illusion of expanding spacetimes momentum?
... the distance from the mass (like an expanding light cone, ... from the spacetime 'fabric'), and the 'force' of gravity is really ... universal expansion - because that is what the above shows - you are mixing ... appear to grow or stretch as the universe gets older. ...
(sci.physics.relativity) - Re: What if gravity isnt a force, just an illusion of expanding spacetimes momentum?
... the distance from the mass (like an expanding light cone, ... from the spacetime 'fabric'), and the 'force' of gravity is really ... universal expansion - because that is what the above shows - you are ... appear to grow or stretch as the universe gets older. ...
(sci.physics.relativity) - Re: What if gravity isnt a force, just an illusion of expanding spacetimes momentum?
... the distance from the mass (like an expanding light cone, ... from the spacetime 'fabric'), and the 'force' of gravity is really ... universal expansion - because that is what the above shows - you are mixing ... appear to grow or stretch as the universe gets older. ...
(sci.physics.relativity) - Re: What if gravity isnt a force, just an illusion of expanding spacetimes momentum?
... the distance from the mass (like an expanding light cone, ... from the spacetime 'fabric'), and the 'force' of gravity is really ... How does the expansion generate the force? ... appear to grow or stretch as the universe gets older. ...
(sci.physics.relativity) - Re: Size of the universe question ?
... the Big Bang just caused it to expand. ... The universe is 14 billion years old, we can detect object as far away as 90+ billion light years. ... So no matter where we where it would be impossible to see object 90 billion ly's away... ... OK, I see how how the math works, but I can't get to the 90+ billion light years (which is the max distance that the furthest object detected so far is that I can find info on). ...
(uk.sci.astronomy) |
|
