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steve000
2008-Feb-18, 01:54 PM
(I'm going to have to call it repulsive force/energy, basically because I don't know what to call it?)

I'm guessing that there was a repulsive force/energy that expanded in every possible direction (At the speed of light or faster) from the point of expansion (That must be still in effect today as the universe is still expanding)... What would the effect be (if there is any?), on that repulsive force/energy, if it interacts (in every possible direction) with a "wall" of mass energy?

Cougar
2008-Feb-18, 04:04 PM
I'm guessing that there was a repulsive force/energy that expanded in every possible direction (At the speed of light or faster) from the point of expansion...
Every point in space is a point of expansion. But you need to accumulate a length of 100 million or so lightyears of such points to be able to differentiate between the effect of expansion and local motion.

What would the effect be (if there is any?), on that repulsive force/energy, if it interacts (in every possible direction) with a "wall" of mass energy?
As suggested above, you'd need an awfully big "wall" to notice any effect at all. And I'm not sure "interaction" is even the right word.....

steve000
2008-Feb-18, 10:37 PM
Every point in space is a point of expansion.

Does energy travel across those reference points or has every reference point got it's own repulsive/energy point that never changes?

Cougar
2008-Feb-18, 11:09 PM
Does energy travel across those reference points or has every reference point got it's own repulsive/energy point that never changes?
Every point has its own repulsive/energy point that never changes. It is probably better to say that every volume of space has its own repulsive/energy content that never changes (but I suppose the volume one chooses can be arbitrarily small).

This is true if the accelerating expansion is accurately described by the cosmological constant (CC). (There are other possibilities.) The CC describes a simple scalar field where each point in space has a single number attached to it -- its expansion energy. With the CC, the odd thing is, as a volume of space expands, the energy content of its space does not get "thinner". It stays constant. If it wasn't like this, the expansion wouldn't be accelerating.

steve000
2008-Feb-19, 11:34 AM
Every point has its own repulsive/energy point that never changes. It is probably better to say that every volume of space has its own repulsive/energy content that never changes (but I suppose the volume one chooses can be arbitrarily small).

This is true if the accelerating expansion is accurately described by the cosmological constant (CC). (There are other possibilities.) The CC describes a simple scalar field where each point in space has a single number attached to it -- its expansion energy. With the CC, the odd thing is, as a volume of space expands, the energy content of its space does not get "thinner". It stays constant. If it wasn't like this, the expansion wouldn't be accelerating.

I could be reading this wrong but is that saying the expansion energy increases to fill in the gaps (or thinning density) that would be expected by the expansion of an area, so that it remains constant & the increase causes the acceleration?

Cougar
2008-Feb-19, 02:39 PM
While that would have the same outcome, I wouldn't say there's any energy increase to fill in the gaps. I think of it more like a bacterium that asexually reproduces. Where there was one, now there's two, and they're the same. Of course, this analogy breaks down very quickly. There is no outside "nutrient" allowing the process to continue, etc.

steve000
2008-Feb-19, 02:54 PM
While that would have the same outcome, I wouldn't say there's any energy increase to fill in the gaps. I think of it more like a bacterium that asexually reproduces. Where there was one, now there's two, and they're the same. Of course, this analogy breaks down very quickly. There is no outside "nutrient" allowing the process to continue, etc.

Yes... I didn't really mean that there was something with a handful of energy replacing it when needed :) ... and your analogy helps me understand how it is happening...

steve000
2008-Feb-19, 03:46 PM
Has it always multiplied at the same rate..and do we know the speed that it multiplies at?

steve000
2008-Feb-19, 05:42 PM
(in fear of looking a nut job) I'd better clarify why I was asking (in my first question) about expansion energy interacting with a "wall" of mass energy... I wasn't sure if there was any movement (probably the wrong word) across the reference points in space (therefore that's why I asked would there be any "interaction") and not just the outward force...

And as seen as that is not the case....My question probably sounded a bit stupid... :)