Contents

# Contents

## Idea

There are $1/4$-BPS state solutions of type IIB supergravity which locally exhibit black branes in the shape of three $(p_i,q_i)$-strings jointly intersecting. Globally many of such 3-string junctions may combine to form a more complicated network of black string configurations, hence called a string network (Sen 97).

## Properties

### M-Theory lift to membrane triple junctions

The lift to 11d supergravity/M-theory of 3-string junctions is supposed to be given by membrane triple junctions.

## References

The concept goes back to

• Koushik Ray, String networks as tropical curves, JHEP 0809:098, 2008 (arXiv:0804.1870)