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View Full Version : Dark Flow and Dark energy considered the same coin



bebe7
2009-Nov-20, 02:32 AM
Hi all,

I'd be interested to know if anyone has thoughts on whether Dark Energy and Dark Flow are actually the same Universal Force.

Thank you.

Bebe:)

borman
2009-Nov-20, 02:54 AM
I venture to say they are unrelated. Dark Energy is cosmological and expansion is occuring everywhere and not just at one local place. The Dark Flow, while on a large scale, is not universal and is localized to a stream of clusters of galaxies.

AlexInOklahoma
2009-Nov-20, 02:54 AM
What are *your* thoughts on this? I do not think they are the same.

Your turn.

Alex

bebe7
2009-Nov-20, 04:24 AM
What are *your* thoughts on this? I do not think they are the same.

Your turn.

Alex

Short answer, I believe they work together to pull the Universe apart (expand the U).

Would be glad to here other's input.

Bebe :)

John Jaksich
2009-Nov-20, 10:37 AM
bebe7:

Given what I read about the two -- in the links that I found-- they don't appear to be directly related. I tend to argue that the accelerated flow of galaxies to a particular region of "space" may be hastened by dark energy, but there is currently (?) no conclusive, empirical proof that one or the other are the same--as I believe you are asking?




Galaxy cluster (http://chandra.harvard.edu/xray_sources/galaxy_clusters.html)

Dark flow evidence ? (http://www.nasa.gov/centers/goddard/news/topstory/2008/dark_flow.html)

bebe7
2009-Nov-20, 04:15 PM
bebe7:

Given what I read about the two -- in the links that I found-- they don't appear to be directly related. I tend to argue that the accelerated flow of galaxies to a particular region of "space" may be hastened by dark energy, but there is currently (?) no conclusive, empirical proof that one or the other are the same--as I believe you are asking?




Galaxy cluster (http://chandra.harvard.edu/xray_sources/galaxy_clusters.html)

Dark flow evidence ? (http://www.nasa.gov/centers/goddard/news/topstory/2008/dark_flow.html)

I have read several articles indicating that they maybe one and usually found at the edge of the U. Also called Dark Flow/Fluid.

bebe7
2009-Nov-20, 04:25 PM
Here's one article I haven't had time to read yet, but the title is intriguing.

"Universe's dark matter and dark energy may be two faces of the same coin"

http://www.encyclopedia.com/doc/1P3-1422688861.html

Bebe

slang
2009-Nov-20, 11:47 PM
Here's one article I haven't had time to read yet, but the title is intriguing.

"Universe's dark matter and dark energy may be two faces of the same coin"

http://www.encyclopedia.com/doc/1P3-1422688861.html

Bebe

Don't bother, it seems to be an article on the same thing as the Universe Today story you linked to in Q&A, Dr HongSheng Zhao's speculation. Even the title is almost identical. Googling for the text you have in quotes yields many articles with that exact title.

ETA: this story (http://www.universetoday.com/2008/02/06/dark-matter-and-dark-energy-the-same-thing/)

KaiYeves
2009-Nov-21, 12:20 AM
If they're the same coin, which side is the dark side? ;-)

borman
2009-Nov-22, 12:25 AM
Here's one article I haven't had time to read yet, but the title is intriguing.

"Universe's dark matter and dark energy may be two faces of the same coin"

http://www.encyclopedia.com/doc/1P3-1422688861.html

Bebe

If you are going to go the Zhao route, you may as well go all out and give the coin 4 sides where 3 sides are negative: GR inverse squared gravity, Dark Matter inverse linear gravity, the newly discoverd large scale structure time gravity that stops back near redshift z=2 discussed in the Beach paper; and one side that is positive: Dark Energy. At early times they may balanced out or zero summed and so help answer one of the cosmological coincidence problems about how they are all presently witnin 2 orders of each other unlike the other forces which are vastly stronger.