thank you =P

thank you =P
Well lets start with my post in the thread on string theory and see if you have more specific questions.
Originally Posted by mitchellmckain
inst singularity is when the universe begin ?
and how many dimention are in the string theories?
first its called dimensions
second there is 11 dimensions
universe started in a singularity, but accordint to string theory there is no singularity that the universe started in.
y is there so many dimension? do they even use all of them? are even all the dimention actually exist?
why? becuase the physics and string require 11 dimensions to work there.
they do, whats the point else haivng them?
the dimenSions may exist, but there is only 4 visible and acting in ordinary life
11?? i though they were only 6..
11?? i though they were only 6..
11?? i though they were only 6..
11?? i though they are only 6..
11?? i though they are only 6..
11?? i though they are only 6..
No, 6 is the number of times you made the same post.
started with 10, then became 11
NO NO NO NO NO!!!!!Originally Posted by Zelos
I thought I explained this to you before, Zelos!!!!
11 dimension was tried in a theory called Supergravity. It has since been proven that 11 dimensions is impossible. In any case string theory has never, ever, ever used 11 dimensions. For a long time it was either 10 or 26 dimensions depending on which string theory. But the unification of string theory under Mtheory has made 10 dimensions the only option!
The point is that the vibrational modes of the string in enough dimension can corespond to the known types of elementary particles. And the number of dimensions that makes this work is 10 = 1 dimension of time, 3 large dimensions of space and 6 dimension much smaller than a proton.
A singularity is a mathematical term and it refers to mathematical functions like f(x)=1/x which gets bigger and bigger the closer x is to zero. Since the theories of physics are mathematical theories, there can be singularities in theories. Two such singularities in General relativity are black holes and when the universe began. But many singularities appear when you attempt to make a quantum theory of gravity, and the history of the development of unified field theories is the successful elimination of these singularities. Supersymmetry was one such success which led to the theory of Supergravity, but string theory (which also uses supersymmetry) successfully eliminates much more of these singularities than Supergravity.Originally Posted by iLOVEscience
For the most part scientists assume that when there are singularities in a theory of physics it means that the theory is wrong, breaks down, or at least unusable. For most things in the real world to do not go to infinity. So for example physicist will say that General relativity breaks down at the center of a black whole and at the beginning of the universe because of these singularities in the theory.
NO NO NO. i thought you saw pbs nova "The elegent universe" and read it on wikipedia
http://en.wikipedia.org/wiki/String_theory
Dont question me when i am right MOHAHAHAHAIn the 1990s, Edward Witten and others found strong evidence that the different superstring theories were different limits of a new 11dimensional theory called Mtheory. These discoveries sparked the second superstring revolution.
i suggest you dl the elegant universe and watch it, m theory is 11, its the old string theories that WERE 10
i heard that m theory and the string theories have been corrupted
by what?
idk and zelos thz for the sugestion on the elegant universe i found it interesting :D
I am unclear on how a dimension can be smaller than a proton (or, more generally, how a dimension can have a size).
they are simply curled up so small nothing can be in them exept the strings
Originally Posted by Zelos
You are right. I have been caught in one of those ironic twists in the development of physics. None of the seminars I attended at the university when this Mtheory was presented (as it was first coming out) mentioned this low energy limit going to 11d Supergravity. My guess is that no one mentioned it at the time, where I was, because no one really believed it yet. I wonder, however, what happened to that proof that 11dimensions could not work, that I read about. Maybe it had to do with high energy calculations which require a compactification of M theory in order to be useful (which they didn't know how to do yet). Hmmmm....Originally Posted by M. J. Duff Int.J.Mod.Phys. A11 (1996) 56235642
This article by Michio Kaku is really great, which I will quote from
I cannot say that I understand this idea of no fixed dimensionality....Originally Posted by http://www.fortunecity.com/emachines/e11/86/dimens.html
Since the universe is beyond our understanding at this point, saying that it has only 11 dimensions could be 100000000000000th of the actual number. But this statement is obvious, and only a sidenote of the discussion at hand.
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