Contents

# Contents

## Idea

Among the possible $\frac{1}{8}$-BPS states of 11-dimensional supergravity/M-theory is one where three black M2-branes jointly intersect at equal angles (Tseytlin 96)

$M2 \perp M2 \perp M2 \,.$

This is the lift to M-theory of 3-string junctions in type IIB string theory (Krogh-Lee 97, Ramadevi 99), see at string network.

## Properties

### Triple generalization of Chan-Paton factors

Since black M2-branes may also end on M5-branes, in an M-theory lift of how strings end on D-branes as quanta of super Yang-Mills theory, there was the suggestion that this points to a generalization of gauge theories where matrix Lie algebras (matrices of Chan-Paton factors) are enhanced to some kind of higher or hypermatrix structure (FLST 10).

If one accepts the traditional story of the M-theory lift of gauge enhancement on D6-branes, in terms of M2-branes wrapping 2-spheres that touch along the shape of a Dynkin diagram blowup of an ADE-singularity,

graphics grabbed from HSS18

then such triple membrane junctions must correspond to blowups of the dihedral, tetrahedral, octahedral or icosahedral ADE-singularities, since in these cases the Dynkin diagram has a triple junction node :

brane intersections/bound states/wrapped branes

S-duality$\,$bound states:

intersecting$\,$M-branes:

## References

Discussion of triple-membrane junction-shaped black brane-solutions to 11-dimensional supergravity is in

Lift of and relation to string networks is discussed in

• Morten Krogh, Sangmin Lee, String Network from M-theory, Nucl. Phys. B516:241-254, 1998 (arXiv:hep-th/9712050)

• P. Ramadevi, Supergravity Solution for Three-String Junction in M-Theory, JHEP 0006 (2000) 005 (arXiv:hep-th/9906247)

Possible relation to hypermatrices is discussed in

• Yuhan Fang, Shir Levkowitz, Hisham Sati, Daniel Thompson, Hypermatrix factors for string and membrane junctions, J. Phys. A43: 505401, 2010 (arXiv:1001.5166)

Last revised on November 27, 2019 at 15:31:09. See the history of this page for a list of all contributions to it.