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Sep28-09, 02:58 PM
Sci Advisor
P: 5,366
Quote Quote by arivero View Post
N=8 SUGRA. But it is a compactification of D=10 or D=11 SUGRA, isn't it? And it is related to a limit of string theory ...
I am not so sure about that.

It seems that duality in string theory relies basically on large-N limit considerations. So perhaps it's exactly the other way round: not ordinary gauge fields are (low-energy) limits of strings, instead string theory may be the large-N limit auf certain gauge theories. If this is true, SUGRA may very well be an own candidate w/o the requirements to derive it from strings.

One question: which SUGRAs are the limits of certain string theory and which are not?