Cheng, Miranda C.N.; Verlinde, E.P.
(Symmetry, Integrability and Geometry: Methods and Applications, 2008)
The appearance of a generalized (or Borcherds-) Kac-Moody algebra in the spectrum of BPS dyons in N=4, d=4 string theory is elucidated. From the low-energy supergravity analysis, we identify its root lattice as the lattice ...