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• CommentRowNumber1.
• CommentAuthorUrs
• CommentTimeJan 24th 2020

Starting something. Not done yet, but need to save.

• CommentRowNumber2.
• CommentAuthorUrs
• CommentTimeJan 24th 2020

now some minimum in place.

• CommentRowNumber3.
• CommentAuthorDavid_Corfield
• CommentTimeJan 24th 2020

I was just reminded of John Baez years ago describing Bar-Natan’s paper on the four-color problem and the relation between $SU(2)$ and $SU(n)$ gauge theory. Bar-Natan’s paper is here.

• CommentRowNumber4.
• CommentAuthorUrs
• CommentTimeJan 24th 2020

Thanks, excellent. So let’s add that to all related entries:

On the logical equivalence between the four-colour theorem and a statement about transition from the small N limit to the large N limit for Lie algebra weight systems on Jacobi diagrams via the ’t Hooft double line construction:

• CommentRowNumber5.
• CommentAuthorUrs
• CommentTimeJan 24th 2020
• (edited Jan 24th 2020)

I wonder if Bar-Natan didn’t know that the double line construction he uses so effectively is earlier due to ’t Hooft, or if he intentionally chose to never cite him. Seems a curious omission.

• CommentRowNumber6.
• CommentAuthorDavid_Corfield
• CommentTimeJan 24th 2020

That would be fun if M-theory could help out with the four-colour problem!

• CommentRowNumber7.
• CommentAuthorUrs
• CommentTimeJan 24th 2020

added this pointer on 1/N corrections in 2d QCD:

• CommentRowNumber8.
• CommentAuthorUrs
• CommentTimeJan 24th 2020

• David Jorrin, Nicolas Kovensky, Martin Schvellinger, Towards $1/N$ corrections to deep inelastic scattering from the gauge/gravity duality, JHEP 04 (2016) 113 (arXiv:1601.01627)
• CommentRowNumber9.
• CommentAuthorUrs
• CommentTimeMar 11th 2020

• Masayasu Harada, Shinya Matsuzaki, and Koichi Yamawaki, Implications of holographic QCD in chiral perturbation theory with hidden local symmetry, Phys. Rev. D 74, 076004 (2006) (doi:10.1103/PhysRevD.74.076004)
• CommentRowNumber10.
• CommentAuthorUrs
• CommentTimeAug 30th 2021

• Yosuke Imamura, Finite-$N$ superconformal index via the AdS/CFT correspondence (arXiv:2108.12090)