T-duality and others

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Hi all,

I found this description of T-duality [1] which is fairly technical and I don't get it =) so can anyone please explain what T-duality is? I was also reading something on the holographic principal and from what I know about T-duality, one of its implications is that space and time might be emergent of something more fundamental. The holographic principal states that "reality" lies on the outer edges of the universe or more formally the "event horizon" of the universe, does T-duality have any implications that relate it to the holographic principal? As I understand there are 2 more dualities: S and U which are used in string theory, do they have any relation to the holographic principal? As always any links to papers and such would be very much appreciated and thanks for your time.

- Vikram

[1] http://www.theory.caltech.edu/people/jhs/strings/str152.html
 

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