Expansion of the universe began accelerating 5 or 6 billion years ago. I'm wondering if this was when the repulsive force of dark energy overtook the mutual gravitational attraction of galaxies (when the universe got large enough). I'm wondering if the repulsive force of dark energy INCREASES with distance, where gravity DECREASES with distance.
"Time is nature's way of keeping everything from happening at once." - Woody Allen
Are you suggesting the the mathematical "inverse square law" is violated by dark energy? Or that the gravitational "constant" is not necessarily a constant value?
---Poppa Chris---
"Second star to the right - Then straight on until morning!" - Peter Pan
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How about an inverse of the inverse square law for the negative pressure of dark energy? This would support my thought, where the repulsive force increases with distance.
Jim Hartsell How about an inverse of the inverse square law for the negative pressure of dark energy? This would support my thought, where the repulsive force increases with distance.
Interesting thought but not real logical, the inverse of the inverse is the original - therfore you would square the unit of force for every unit of distance. Forces would become so incomprehensibly huge in such a very short distance that the universe could not exist at all.
I should have said REVERSE Inverse Square Law, if you can imagine what that would be. It may not involve the Inverse Square Law at all. It could be a relativistic thing. If I could explain it in the detail you want, I'd be writing a feature article in Astronomy magazine. But yes, it would violate the Inverse Square Law.
Do you believe the universe is expanding? That the expansion began accelerating after a period of time?
Jim Hartsell Expansion of the universe began accelerating 5 or 6 billion years ago. I'm wondering if this was when the repulsive force of dark energy overtook the mutual gravitational attraction of galaxies (when the universe got large enough). I'm wondering if the repulsive force of dark energy INCREASES with distance, where gravity DECREASES with distance.
Jim,
That is exactly what some cosmologists believe. The repulsive force of dark energy grows in strength as cosmological expansion increases.
http://www.universetoday.com/11933/has-dark-energy-always-been-constant/
Dave Mitsky
Chance favors the prepared mind.
Fere libenter homines id quod volunt credunt.
A man is a small thing, and the night is very large and full of wonders.
Dave,
Thanks for your reply and the link. For the overtaking part, I just found the 2007 link
http://www.redorbit.com/news/science/1085903/mysterious_dark_energy_winning_cosmic_tug_of_war/index.html,
which says
"But in the last 5 billion years, dark energy - a sort of "negative gravity" or "repulsive" force - has overcome gravity and is driving galaxies apart at an ever-increasing rate."
This again implies that the repulsive force of dark matter does indeed increase with distance.
I'm three years too late, so I quess they won't be calling it "The Hartsell Effect".