crocodile deathroll

Now could this accelerating universe be due to "dark-matter/energy" explosions in very distant objects like black holes colliding, releasing copious amounts of extra dark-energy and thus extra vacuum into the universe thrusting it apart at an ever accelerating rate, which would be rather like a rocket thruster being continuously switched on if we take into account the sum total of all these dark-matter/energy explosions in the entire history of the universe .

A gravity wave detector may well detect this phenomena. I understand we do know now that it is dark-matter that hold the galaxies together, otherwise they will all fly apart with centrifugal force of their rotation. But what happens if dark-matters comes into contact with anti-dark-matter or when two dark-matter black holes collide if they exist?. Dark-matter may well be so mysterious it may well not be a burst of gamma rays like when conventional bayonic matter meets matter but a burst of pure dark-energy. The gravity detected in the distant object will suddenly get weaker as it is driving the rest of the universe (including us) farther away from itself with the release of extra dark-energy and vacuum into the universe.

Or if we may not have to wait years for the development of gravity wave detectors, telescopes like the ones at the Keck observatory could find evidence of a sudden lengthening of red shift in distant galaxies detected suggesting the release of dark-energy.
A distant galaxy will appear to dim with extra volume of vacuum enveloping it in a dark-energy explosion if the theory is right. I would like to see the theory corroborated with observational tests just to see if distant and constantly luminous objects do suddenly dim and continue to remain at that dimmer state with a longer red shift as a result. I would love some scientist to investigate these red shift anomalies. If there absolutely no evidence of sudden dimming then I understand the theory will have to be scrapped. I know there would have been many well documented data of the red shift of many distant objects so if may pay to check them through for any increase or sudden increase of their red shift over time.

crocodile deathroll

Answerer

Well, I thought that the cause for universe's acceleration was due to either the repulsive nature of gravity given by the cosmological constant or the zero-point energy of the vacuum instead of dark matter.

crocodile deathroll

I understood that gravity was a repulsive force during the inflation epoch of the universe but that reversed as all the unified forces of nature had under gone three phase transitions to reach the four forces of nature we observe today.

CD

Answerer

Well, but still repulsive nature of the gravity reminds up to today. Although the repulsive effect of gravity is not that obvious within a short range between two objects, we should able to experience its effect if the two objects are placed within a large separation.

crocodile deathroll

I now more of the understanding a vacuum is more than just a dark nothingness that is static and still as matter an energy passes trough if but is composed of virtual particles that split into 2 real particles in matter and antimatter pairs then then combine and annihilate each other.
A vacuum with all if its constituent virtual particles actually moves with the matter and as such the matter does not really move through it.
When a hypernovas explode they create new dark energy and so inject an extra burst of vacuum into the universe.
A nice analogy I think it would be a bit like blowing up a balloon with air that is impregnated micoscopic capsules of compressed air, and every so often one of those capsules will pop and cause the balloon to inflate a little further even after sealed and tied it up.
If this sufficiently explains the accelerating universe, they why would you need a cosmological constant?

Answerer

Well, actually I think that we are talking about the same thing all this while, your mentioning of the existence of virtual particles in the vaccum actually correspond to the term 'zero-point energy of the vaccum' which I had talked about. And physicists had used the cosmological constant in their calculations to represent the zero-point energy of the vaccum, so there is nothing wrong with using the constant after all.

crocodile deathroll

Yes you are right. We are entering a phase where the universe is tearing itself apart and there is nothing we can do about it <img src="graemlins/boohoo.gif" border="0" alt="[Boo Hoo]" />