### Strings 09

The Strings 09 slides are now online. Get your fix of Arkani-Hamed twistors here! The Grassmanians and Schubert maths starts on slide 42, which contains an example that has the answer 42!

occasional meanderings in physics' brave new world

The Strings 09 slides are now online. Get your fix of Arkani-Hamed twistors here! The Grassmanians and Schubert maths starts on slide 42, which contains an example that has the answer 42!

## 1 Comments:

I looked at the slides. I admire non-specialists able to get out something from this kind of representations. I think that most of the content is in comprehensible form in the article of Nima et al.

I understand that the dream is to replace AdS with Minkowski space in AdS/CFT correspondence. N=4 SUSY would be the conformal QFT. In the spirit of decades old tradition, these people start from mathematics instead of physics.

Maybe the idea about the replacement M^4 as AdS^5 boundary with lightcone boundary as boundary of future lightcone of M^4 emerges sooner or later since light-cone boundary is very twistorial notion. This will undoubtly lead to a (re)discovery that super-conformal symmetries generalize immensely at light-cone boundary having metric dimension 2. The discovery (without "re-") that 4-D Minkowski space as something completely unique will generate a flood of popular articles and books.

I have however more or less given up the hope that the idea about replacement strings with light-like 3-surfaces in H=M^4xCP_2 (local variant of lightcone and also a twistorial notion) could be (re)discovered during this century. After this it should be easy to realize that also light-like 3-surfaces possess huge super-conformal symmetries, and some day someone will realize that Equivalence Principle is coded by the analog of coset construction for these conformal symmetries. 4-dimensionality of space-time finally understood!: this will be certainly one of the titles of popular articles.

At year 21xx we will have holography in our physical 4-D space-time regarded as a sub-manifold of M^4xCP_2 suitably generalized. There is no need for all this extra stuff which paralyzed the theoretical physics for a century (dynamical imbedding space, spontaneous compactification, Calabi-Yau manifolds, all kinds of brane constructions, and a hierarchy of increasingly baroque theories (superstrings, M-, F-, trilobite- , etc...).

And also condensed matter physicists will be happy. The theory of high T_c super-conductivity would not need 10-dimensional Reissner-Nordstrom blackholes in AdS_4xS^6 as an extra stuff to be explained away!

Well, just daydreaming....

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