Hidden Symmetries , Central Charges and All That ∗

  title={Hidden Symmetries , Central Charges and All That ∗},
  author={Bernard de Wit and Hermann Nicolai},
In this review we discuss hidden symmetries of toroidal compactifications of 11-dimensional supergravity. We recall alternative versions of this theory which exhibit traces of the hidden symmetries while still retaining the massive Kaluza– Klein states. We reconsider them in the broader perspective of M-theory which incorporates a more extended variety of BPS states. We also argue for a new geometry that may underly these theories. All our arguments point towards an extension of the number of… CONTINUE READING