Parrallel Universe Regained?

[dipayankar]

Hi Friends,

Kindly refer to this link:

http://www.astronomy.com/asy/default.aspx?c=a&id=7423

The news says that there is a pull for some Galaxies that cannot be explained by the normal matter in our observable universe as well as the normal rate of Universal expansion. The scientists say that some matter outside the observable Universe is causing such a pull.

We all know (and probably believe) in cosmic inflation. Probably there was one instatnce of cosmic inflation. The observable universe today is around 13.5 billion light years old. One inflation lasting a microsecond can not expand matter beyond a certain limit. The amount of matter that would be required to cause the galactic pull is huge. Which suggests that this Universe could be hundreds of billions of years old (which in effect would rule out a cyclic universe) OR

We need to relook at the long forgotten theory of Parallel Universe which interact with our Universe through gravity thus making gravity a weak force.

Your thoughts please...

[Farsight]

There's no need to try to explain this via parallel universes. The trick is to understand what gravity is. It's an inhomogeneity in space, normally caused by matter. But space has been expanding between the galaxies but not within, so it isn't homogeneous. The result is a gravitational field, but there's no dark matter causing it. It's just an unevenness in dark energy, which is the innate energy of space. This "dark flow" is more of the same.

[Max™]

I've often thought of what would happen if two universes expanded "near" one another, the sort of jostling interaction I imagine would seem very odd from within either universe.

I wouldn't expect other universes to interact so early in either sisters history though, given the heat death > black hole birth model I've been working out, they would be spread out quite naturally by their mother universe.

Looking at this universe though, I would suspect that there were billions of other universes with big bangs roughly at the same "time" as our universe started, so I guess it wouldn't be completely unexplainable if one of them happened to be closer to ours than the normal spread I pictured.


That is all ridiculously theoretical though, just where my models led me.

[dleviwing]

I’m sure your opinion will be given due consideration John.

The news says that there is a pull for some Galaxies that cannot be explained by the normal matter in our observable universe as well as the normal rate of Universal expansion. The scientists say that some matter outside the observable Universe is causing such a pull.

You seem to have read something different than I did in that article Dip. Interesting link though.

[Graybeard]

Hi Friends, Kindly refer to this link:http://www.astronomy.com/asy/default.aspx?c=a&id=7423

The news says that there is a pull for some Galaxies that cannot be explained by the normal matter in our observable universe as well as the normal rate of Universal expansion. The scientists say that some matter outside the observable Universe is causing such a pull.

You seem to have read something different than I did in that article Dip. Interesting link though.

The cause, they suggest, is the gravitational attraction of matter that lies beyond the observable universe.

Dave, are you referring to Dip's interpretation re: parallel universes, or the article para that he quotes above ?

cool bananas ... greg

[dipayankar]

The question is why are the galaxies moving away as they are doing? Have they caught a gravity draft? Or is there some anomaly in gravity that we are noticing. Dave, Antonio your take please...

[dipayankar]

Your model is interesting Max. The Universes to interact with each other would require the same laws of nature at each end or exactly the opposite type of laws. Else there would be no interaction at all..

I've often thought of what would happen if two universes expanded "near" one another, the sort of jostling interaction I imagine would seem very odd from within either universe.

I wouldn't expect other universes to interact so early in either sisters history though, given the heat death > black hole birth model I've been working out, they would be spread out quite naturally by their mother universe.

Looking at this universe though, I would suspect that there were billions of other universes with big bangs roughly at the same "time" as our universe started, so I guess it wouldn't be completely unexplainable if one of them happened to be closer to ours than the normal spread I pictured.


That is all ridiculously theoretical though, just where my models led me.

[neutralino]

Hi Friends,

Kindly refer to this link:

http://www.astronomy.com/asy/default.aspx?c=a&id=7423

The news says that there is a pull for some Galaxies that cannot be explained by the normal matter in our observable universe as well as the normal rate of Universal expansion. The scientists say that some matter outside the observable Universe is causing such a pull.

This just means that we can't see the matter causing the observed phenomena: it does not imply that this matter is hiding in a hidden dimension.

Of course, extra dimensions do give one hint as to what dark matter is. If we imagine our universe being a 3 dimensional 'brane' in a higher dimensional space, dark matter would be described as matter on another such brane. We wouldn't be able to see it, but it would interact with us gravitationally (since gravity can travel through the extra dimensions). The latter point is, as you say, an 'explanation' as to why gravity is weak: namely, it unlike the other forces, dissipates throughout the bulk.

[dipayankar]

I think you are right there Neutralino. However I was reading a book called 'A biography of the Universe' which says that Hot Dark matter is nothing but gases at above 1 million Kelvin. And cold dark matter is you i.e. neutralino all of which are confined to the 3 dimensions of this Universe.

This just means that we can't see the matter causing the observed phenomena: it does not imply that this matter is hiding in a hidden dimension.

Of course, extra dimensions do give one hint as to what dark matter is. If we imagine our universe being a 3 dimensional 'brane' in a higher dimensional space, dark matter would be described as matter on another such brane. We wouldn't be able to see it, but it would interact with us gravitationally (since gravity can travel through the extra dimensions). The latter point is, as you say, an 'explanation' as to why gravity is weak: namely, it unlike the other forces, dissipates throughout the bulk.

[buckeyballs]

Wow! first post--hope this is close enough to the existing thread. How about the possibility that everything we call ' our universe ' is inside a black hole. If anything, this might explain the reason our universe is expanding ---it's approaching it's event horizon--from the inside.