Unity of superstring dualities

@article{Hull1995UnityOS,
  title={Unity of superstring dualities},
  author={Christopher M. Hull and Paul K. Townsend},
  journal={Nuclear Physics},
  year={1995},
  volume={438},
  pages={109-137}
}
Abstract The effective action for type II string theory compactified on a six-torus is N = 8 supergravity, which is known to have an E7 duality symmetry. We show that this is broken by quantum effects to a discrete subgroup, E 7 ( Z ) , which contains both the T-duality group O(6, 6; Z ) and the S-duality group SL(2; Z ). We present evidence for the conjecture that E 7 ( Z ) is an exact ‘U-duality’ symmetry of type II string theory. This conjecture requires certain extreme black hole states to… 

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