camcelve Posted December 31, 2011 Share Posted December 31, 2011 Why does classical string theory have only 9 dimensions? Link to comment Share on other sites More sharing options...
ydoaPs Posted December 31, 2011 Share Posted December 31, 2011 Classical string theory? o.O Link to comment Share on other sites More sharing options...
michel123456 Posted December 31, 2011 Share Posted December 31, 2011 Because there are 9 letters in the word classical ? Link to comment Share on other sites More sharing options...
ajb Posted December 31, 2011 Share Posted December 31, 2011 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. Link to comment Share on other sites More sharing options...
michel123456 Posted January 1, 2012 Share Posted January 1, 2012 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? Link to comment Share on other sites More sharing options...
ajb Posted January 2, 2012 Share Posted January 2, 2012 Oho, seriously now 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. Link to comment Share on other sites More sharing options...
ydoaPs Posted January 2, 2012 Share Posted January 2, 2012 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. I thought some from of loop quantum gravity predicted 4 dimensions, but I may be wrong. Link to comment Share on other sites More sharing options...
ajb Posted January 2, 2012 Share Posted January 2, 2012 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. Link to comment Share on other sites More sharing options...
michel123456 Posted January 2, 2012 Share Posted January 2, 2012 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. Link to comment Share on other sites More sharing options...
Recommended Posts
Create an account or sign in to comment
You need to be a member in order to leave a comment
Create an account
Sign up for a new account in our community. It's easy!
Register a new accountSign in
Already have an account? Sign in here.
Sign In Now