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Author Topic: dark matter/energy  (Read 1838 times)

Offline Matic_Magister

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dark matter/energy
« on: 24/03/2012 21:16:32 »
I was wondering... Since dark energy is suppose to be the one that is driving galaxies apart at an ever increasing speed, i was wondering. Every galaxy has untold numbers of black holes and a massive one at its centre right? Would it be possible that dark energy could originate as a product of black holes "consuming" matter? The more black holes across the universe consume over time, the more dark energy is created thus ever increasing speed of expansion. I think this could even be calculated, tested and simulated to see if it holds any truth.


 

Offline MikeS

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Re: dark matter/energy
« Reply #1 on: 25/03/2012 09:17:13 »
Seems unlikely to me as the repulsive force, whatever that is, seems to only work over vast distance where mass is virtually absent. 
 

Offline imatfaal

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Re: dark matter/energy
« Reply #2 on: 26/03/2012 09:59:43 »
Mike has hit the nail on the head - gravitationally bound systems (galaxies, clusters, superclusters) stay bound; it is the wide open spaces without mass that we notice change. 

Not sure about the terms "driving galaxies apart" or "repulsive force" - whilst we don't know what is going on, the best bets focus on a background expansion rather than some inverted gravity
 

Offline greeniemax

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Re: dark matter/energy
« Reply #3 on: 29/03/2012 10:34:25 »
If what you said would be right dark energy would work highest near the black hole itself, which doesn't seem to be case as our galaxy isn't expanding but distance between it and other galaxies.

What I think it could be, imagine if you blow up a balloon and put it in vacuum, the bubble would expand at accelerated rate at first later it would slow down as we do not have right age for end of the universe we don't know the percentage of life of universe (yes we know 13.75 0.11 billion years) but we don't know when its suppose to end thus we do not know the full scale of it, we can't point where we are on the life scale of universe.

We know that universe is full of dark matter at least near the edges of galaxies, we could assume that the dark matter would even go beyond galaxies (i.e. between galaxies), thus analogy of bubble could be used here and outside the universe we would have no dark matter, as two atoms would repel each other at close distance because of their electrons and attract each other at larger distance due to gravity (even though we have no clue about Quantum Gravity), thus energy of accelerated expansion is because dark matter wants to occupy as much space as possible.
 

Offline yor_on

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Re: dark matter/energy
« Reply #4 on: 30/03/2012 21:12:09 »
I don't know. I'm still not sure how to see the idea of an expansion between galaxies. To me it seems unreasonable to assume it to happen only between galaxies. More reasonable is to assume that it happens everywhere but that 'gravity's potential' moors the invariant mass to its neighbors in the galaxies. If it is that way, then the expansion is taking place inside everything containing a 'space' as I presume. Then again, what is a vacuum :) And what the he** is a 'distance'?
 

Offline greeniemax

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Re: dark matter/energy
« Reply #5 on: 30/03/2012 22:45:05 »
The expansion happens between galaxies is because there is no source of gravity in between them, this is why I assume that dark matter wouldn't have gravity, it could be effected by gravity but wouldn't have its own attraction or gravitation field.

But everything inside the galaxy (i.e. Stars and Planets) wouldn't expand because they have source of gravity that is preventing them from expanding.
 

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Re: dark matter/energy
« Reply #5 on: 30/03/2012 22:45:05 »

 

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