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Why does classical string theory have only 9 dimensions?
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Why does classical string theory have only 9 dimensions?
String theory
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#2
31 December 2011 - 05:32 PM
ydoaPs 
just lost the game
Classical string theory? o.O
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#3
31 December 2011 - 06:07 PM
michel123456
Molecule
Because there are 9 letters in the word classical ?
Michel
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#4
31 December 2011 - 06:35 PM
ajb
Physics Expert
When one quantises the superstring, that is apply the rules of quantum theory to the strings, does the condition that the theory be formulated on 9+1 dimensions become important. In any other dimensions the resulting quantum string theory is not well defined and inconsistent.
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#5
1 January 2012 - 06:31 PM
michel123456
Molecule
ajb, on 31 December 2011 - 06:35 PM, said:
When one quantises the superstring, that is apply the rules of quantum theory to the strings, does the condition that the theory be formulated on 9+1 dimensions become important. In any other dimensions the resulting quantum string theory is not well defined and inconsistent.
Oho, seriously now
9+1
Is that 3^2 dim of space + 1 of time?
Michel
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#6
2 January 2012 - 04:54 PM
ajb
Physics Expert
michel123456, on 1 January 2012 - 06:31 PM, said:
Oho, seriously now
9+1
Is that 3^2 dim of space + 1 of time?
9+1
Is that 3^2 dim of space + 1 of time?
Yes, 9 space and one time, for superstrings.
String theory, as far as I know, is the only theory that predicts the number of dimensions it needs to be formulated in.
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#7
2 January 2012 - 05:08 PM
ydoaPs
just lost the game
ajb, on 2 January 2012 - 04:54 PM, said:
Yes, 9 space and one time, for superstrings.
String theory, as far as I know, is the only theory that predicts the number of dimensions it needs to be formulated in.
String theory, as far as I know, is the only theory that predicts the number of dimensions it needs to be formulated in.
I thought some from of loop quantum gravity predicted 4 dimensions, but I may be wrong.
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#8
2 January 2012 - 05:15 PM
ajb
Physics Expert
ydoaPs, on 2 January 2012 - 05:08 PM, said:
I thought some from of loop quantum gravity predicted 4 dimensions, but I may be wrong.
I don't think that loop quantum gravity predicts 3+1 dimensions, but this is the number of dimensions it is usually formulated in. I am not sure about the status of including all the matter fields into loop quantum gravity in 3+1 dimensions.
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#9
2 January 2012 - 05:22 PM
michel123456
Molecule
3^2 can be represented as if each dimension of space had 3 dimensions: length, width, height.
But since the width of one dimension is the length or width of the other, it becomes redundant. And there is no need for curled up dimensions.
Also
you can create length by extending a point over time. You can create width & height the same way: a point along time. So that all spatial dimensions can be constructed by a single point extending over time, in 3 directions. Or 9 directions minus 6 redundant.
Which products a spatial framework made from a point litterally exploding in time.
But since the width of one dimension is the length or width of the other, it becomes redundant. And there is no need for curled up dimensions.
Also
you can create length by extending a point over time. You can create width & height the same way: a point along time. So that all spatial dimensions can be constructed by a single point extending over time, in 3 directions. Or 9 directions minus 6 redundant.
Which products a spatial framework made from a point litterally exploding in time.
Michel
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