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Dark Matter as a Repulsive Force

Vox_Veritas
Posts: 7,251
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5/30/2015 8:22:18 PM
Posted: 2 years ago
(In this context, "Repulsive" is simply means that the object to which this adjective is added repels other things.)

Is Dark Matter repulsing all matter away from it and causing Universal Expansion?
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dee-em
Posts: 7,862
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5/30/2015 11:54:52 PM
Posted: 2 years ago
At 5/30/2015 8:22:18 PM, Vox_Veritas wrote:
(In this context, "Repulsive" is simply means that the object to which this adjective is added repels other things.)

Is Dark Matter repulsing all matter away from it and causing Universal Expansion?

That's Dark Energy.

http://en.wikipedia.org...

Independently of its actual nature, dark energy would need to have a strong negative pressure (acting repulsively) in order to explain the observed acceleration of the expansion of the universe.
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DanneJeRusse
Posts: 13,644
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5/31/2015 1:05:50 PM
Posted: 2 years ago
At 5/30/2015 8:22:18 PM, Vox_Veritas wrote:
(In this context, "Repulsive" is simply means that the object to which this adjective is added repels other things.)

Is Dark Matter repulsing all matter away from it and causing Universal Expansion?

Not really, it's just matter that does not emit or reflect electromagnetic radiation that can be picked up or "seen" by telescopes, however the effect it has on visible matter and electromagnetic radiation is detectable and measurable.
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Subutai
Posts: 4,065
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5/31/2015 3:11:54 PM
Posted: 2 years ago
At 5/30/2015 8:22:18 PM, Vox_Veritas wrote:
(In this context, "Repulsive" is simply means that the object to which this adjective is added repels other things.)

Is Dark Matter repulsing all matter away from it and causing Universal Expansion?

No. For one, "bright" matter would still be gravitationally attracted to dark matter, but also the electromagnetic force that it emits would be negligible because the charge distribution balances all the forces.

It's really dark energy that is causing the universe to expand.
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Saint_of_Me
Posts: 2,402
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6/2/2015 6:35:10 PM
Posted: 2 years ago
You are confusing Dark Matter with Dark Energy, amigo.

Ya see.......we currently attribute this accelerating expansion to dark energy, so called because its exact nature remains a mystery, but something must fill the vast reaches of space to account for the accelerating expansion.

We might not know what dark energy is just yet, but scientists have a few leading theories. Some experts believe it to be a property of space itself, which agrees with one of Einstein's earlier gravity theories. In this, dark energy would be a cosmological constant and therefore wouldn't dilute as space expands. Another partially disproven theory defines dark energy as a new type of matter. Dubbed "quintessence," this substance would fill the universe like a fluid and exhibit negative gravitational mass [source: NASA]. Other theories involve the possibilities that dark energy doesn't occur uniformly, or that our current theory of gravity is incorrect.

Dark matter, by comparison, is far better understood. It doesn't emit or reflect light, but scientists can estimate where it is based on its gravitational effects on surrounding matter. Scientists use a technique called gravitational lensing to accomplish this, observing the way dark matter's gravitational pull bends and distorts light from distant galaxies.

These observations rule out stars, antimatter, dark clouds or any form of normal matter. Some scientists consider supermassive black holes a potential candidate for dark matter, while others favor either MACHOs (massive compact halo objects) and WIMPs (weakly interacting massive particles). MACHOs include brown dwarfs, weak stars that exert a gravitational pull but emit no light. WIMPs, on the other hand, would constitute a radically different form of matter left over from the big bang.
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