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Thread: Some cranky notions regarding Brane cosmology

  1. #1

    Some cranky notions regarding Brane cosmology

    I'm not sure how cranky these notions of mine are ... but I figured Bad Astronomy would be a good place to set them up as a shooting target and see if there is anything left of it.



    Brane Cosmology in a subset of M theory ( and also Quantum loop gravity theory ), that assumes that this universe was created in a collision between two adjacent (mem)Branes.

    Expansion:

    One of the things that struck me about this was that it could provide a cause for both Expansion, and the anti-matter problem. Specifically, if the stuff that became mass-energy was created by the collision, and the two branes collided at lightspeed in a cosmos-wise direction at two points that were "near" each other at the tops of very gentle curves, that the point of intersection would seem to expand and contract at a speed greater than C.

    Not that anything was actually moving here, except two Branes vibrating at C ... the expansion of the intersecting area would merely seem to be "motion" at a speed greater than C.

    If this intersecting area was exactly the distance of the initial Expansion, it would explain Expansion without invoking superluminal speeds.

    ( The odds of such a collision would need to be low enough for proton decay to clean up the evidence of the last collision, IMO. )

    As for the anti-matter problem, maybe the directional bias of each Brane helped determine a bias between matter and antimatter? The Brane we collided with earlier might be a very hostile place to visit, and may have all of "our" anti-matter.


    Dark Matter and post-big bang clumping:

    Another feature of Brane theory, and the reason it was cooked up in the first place, was to explain gravitational force weakness by assuming leakage. Strong forces stay on this Brane, but weak ones like gravity leak.

    This leakage generates an interesting question: Can a seriously attenuated gravity effect mass in adjacent Branes?

    This would not be enough to cause immediate gross effects, but in aggregate, might cause large masses in adjacent Branes to slowly move "near" each other in a Cosmos-wise direction, and such stacks of differing galaxies and masses clumping up may cause matter in Branes undergoing early distribution of mass-energy to clump up near these.

    Another effect would be that each galaxy sized object on a Brane would have many invisible companions on other Branes stacked up and contributing to each other's gravity wells. Perhaps enough to explain Dark Matter gravitation?




    Anyway, thanx for taking the time to read some of my wild notions. If someone cooked these up earlier, he/she can take the blame as well.

    Kristopher Barrett
    astronomy dilettante, and Cheyenne Astronomical Society member.

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    Not sure why a directional bias would affect matter/anti-matter symmetries. Any mechanism? Otherwise it isn't an explanation. You may as well say that the frequency of each did it, or the number of cabbages hung off the brane.

    I am not sure how your collision idea explains things like homogeneity of the universe, the flatness problems etc. Or are you trying to explain superluminal expansion at distance?

  3. #3
    Thanx for the input on the antimatter issue. This obviously needs more work. Yes, a mechanism needs to be found for why this universe is biased for matter, and where did the original anti-matter go. The other Brane is a good place to dump the anti-matter, but a reason why this happened is needed. Hmmm ...tasty cabbages ....
    Thanx again for poking a needed hole in this.

    The collision idea is not mine ( it properly belongs to Physicists Paul Steinhardt and Neil Turok ), but I do think that it offers an alternative to superluminal expansion. If the intersection volume of the collision is equal to the volume of the initial expansion, then any kind of superluminal effects are not needed. The area of collision would only seem to be expanding ( and then collapsing as the Branes recede from each other ) at superluminal speed, but the two Branes involved would not actually be moving that fast ( movement would be in a direction not available to us, and does not need to be faster than C ).

  4. #4
    The flatness and homogeneity problem would be a function of the gravity weakness in this universe that Brane theory and it's gravity leakage was originally created to explain.

    If gravity leaks in attenuated form to other Branes, and there are a lot of other Branes out there, then this gravity leakage will, in aggregate, start to have effects on each Brane. Not gross effects, but subtle ones. Over time, mass will start clumping as a result of pre-existing galaxies and clusters on other Branes, and these clumps on each Brane will effect each other in aggregate, encouraging more clumping.

  5. #5
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    I find it difficult to accept any of the brane theories, since there is zero physical evidence of dimensions other than the three space and one time that we live in. See the Wiki article on 'Dimension'.

    Regards, John M.
    I'm not a hardnosed mainstreamer; I just like the observations, theories, predictions, and results to match.

    "Mainstream isn’t a faith system. It is a verified body of work that must be taken into account if you wish to add to that body of work, or if you want to change the conclusions of that body of work." - korjik

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    Don't see how the problem of the uniformity of the CMBR is addressed by a collision. That was what I meant by the homogeneity problem, and it is why we have so far needed expansion. We need the hot dense state to explain nucleosynthesis. We need something to explain how that hot turmoil ended up so ... well, boring! How do two branes, presumably non-homogeneous if they have the structure to seed our structure, generate such a smooth background?
    Last edited by Shaula; 2011-Oct-06 at 05:17 AM. Reason: added non- to homogenous so it made sense

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    Quote Originally Posted by Shaula View Post
    Don't see how the problem of the uniformity of the CMBR is addressed by a collision. That was what I meant by the homogeneity problem, and it is why we have so far needed expansion. We need the hot dense state to explain nucleosynthesis. We need something to explain how that hot turmoil ended up so ... well, boring! How do two branes, presumably homogeneous if they have the structure to seed our structure, generate such a smooth background?
    True. We live in a de Sitter universe. Flat. Expanding. Mostly empty. Again, see the relevant Wiki articles.
    I'm not a hardnosed mainstreamer; I just like the observations, theories, predictions, and results to match.

    "Mainstream isn’t a faith system. It is a verified body of work that must be taken into account if you wish to add to that body of work, or if you want to change the conclusions of that body of work." - korjik

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