Oct 9th 2013, 10:54 AM
|
#11 |
Forum Admin
Join Date: Apr 2008 Location: On the dance floor, baby!
Posts: 2,505
|
Originally Posted by RelativityIsWrong I don't yet have the mathematical wherewithal to understand that... but what I think it is is this:
First, acceleration - due to both leftover from the inflationary period and the dark energy - slows down because the positive gravity is stronger at that range than the dark energy's negative gravity. |
"Positive gravity?" "Negative gravity?" Anyway, the rate of Universal expansion is accelerating as we speak. It is not slowing at all.
Originally Posted by RelativityIsWrong But at a certain distance, because dark energy is constant everywhere, but matter isn't, the dark energy's negative gravity becomes more than the positive gravity. And then it starts to accelerate again after passing this threshold. |
"Dark energy is constant everywhere?" Dark energy appears to be the tendency of "free space" to expand. The idea is that in the space between galaxies there is quite a lot of expansion going on. (This also means that, theoretically, the space inside the atoms in your body is also expanding. Thankfully this is not measurable!) Dark energy is indeed spread about the Universe but for some reason is not as strong in regions where there is mass. So it is by no means "constant."
-Dan
__________________
Do not meddle in the affairs of dragons for you are crunchy and taste good with ketchup.
See the forum rules here.
|
| |