Unity of superstring dualities
Abstract
The effective action for type II string theory compactified on a sixtorus is N = 8 supergravity, which is known to have an E _{7} duality symmetry. We show that this is broken by quantum effects to a discrete subgroup, E _{7}( Z) , which contains both the Tduality group O(6, 6; Z) and the Sduality group SL(2; Z). We present evidence for the conjecture that E _{7}( Z) is an exact 'Uduality' symmetry of type II string theory. This conjecture requires certain extreme black hole states to be identified with massive modes of the fundamental string. The gauge bosons from the RamondRamond sector couple not to string excitations but to solitons. We discuss similar issues in the context of toroidal string compactifications to other dimensions, compactifications of the type II string on K_{3} × T^{2} and compactifications of 11dimensional supermembrane theory.
 Publication:

Nuclear Physics B
 Pub Date:
 February 1995
 DOI:
 10.1016/05503213(94)00559W
 arXiv:
 arXiv:hepth/9410167
 Bibcode:
 1995NuPhB.438..109H
 Keywords:

 High Energy Physics  Theory
 EPrint:
 45 pages. Some minor corrections made and some references added