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January 9th, 2018, 10:14 PM   #1
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Dark matter "equals" dark energy

Dark matter causes an inward acceleration. Dark energy causes an outward acceleration.

Where do they offset each other?
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January 10th, 2018, 02:45 PM   #2
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Dark matter and dark energy are completely different things.

Dark matter is "stuff" that manifests itelf by gravitational effects, just like ordinary matter.

Dark energy appears to be a property of space itself and is much harder to describe physically, since it appears as a term in general relativity description.
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January 10th, 2018, 05:32 PM   #3
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Quote:
Originally Posted by mathman View Post
Dark matter is "stuff" that manifests itelf by gravitational effects, just like ordinary matter.
Jury is still out on this. There's a credible new theory of gravity where dark matter is just an artifact of the force law at very large distances.

https://en.wikipedia.org/wiki/Entropic_gravity
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January 11th, 2018, 02:09 AM   #4
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Quote:
Originally Posted by Loren View Post
Dark matter causes an inward acceleration. Dark energy causes an outward acceleration.

Where do they offset each other?
Little is known about the distribution of dark energy, but dark matter is certainly not homogeneous in the Universe, except at very large scales. Therefore, it's is not a simple balance problem.

Dark matter is unobserved matter that was hypothesised because the rotation profiles of galaxies seem to suggest that some sort of unobserved matter around galaxy haloes. No one knows what dark matter really is, but some people think that rotation profiles can be solved by considering alternative theories of gravity, like MOdified Newtonian Gravity (MOND).

Energy is something that is exchanged in most physical processes. Dark energy is energy that is unaccounted for by known phenomena and was hypothesised because SN 1a observations seem to suggest that the expansion of the Universe is accelerating, which is not accounted for in the vanilla Big Bang model. No one knows what dark energy really is.

Last edited by Benit13; January 11th, 2018 at 02:15 AM.
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