Breaking E_{8} to SO(16) in Mtheory and Ftheory
Abstract
Mtheory on an 11dimensional manifold with a boundary must have E_{8} gauge groups at each boundary in order to cancel anomalies. The type IA supergravity must have SO(16) gauge group at each boundary in order to be a consistent theory. The latter action can be obtained from the former one via dimensional reduction. Here we make use of the current algebra of the open membrane which couples to the former action to explain why the gauge group E_{8} breaks down to SO(16) in going from Mtheory to type IA supergravity. We also use the same current algebra to explain why Ftheory has an E_{8} × E_{8} gauge group in its strong coupling limit while it has an SO(16) × SO(16) gauge group in its weak coupling limit.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1998
 DOI:
 10.1016/S05503213(97)006834
 Bibcode:
 1998NuPhB.512..209A