| These include the theories of superspace and supergravity and the string theory of fundamental particles, which involves the theory of Riemann surfaces in novel and unexpected ways. |
| His groundbreaking work in the areas of superstring theory, supersymmetry and supergravity has made him a leading expert on the topic. |
| The advantage of the extra dimensions is that they allow supergravity theories to incorporate the electromagnetic, weak, and strong forces as well as gravity. |
| Theories involving supersymmetry in its local form are therefore often known as supergravity theories. |
| Hyperspace theory is also referred to as Kaluza-Klein theory and supergravity. |
| Lurking in the 11 th dimension was an entirely new theory which could reduce down to 11 dimensional supergravity as well as 10 dimensional string theory and p-brane theory. |
