Geometry, Gravity and Dual Strings

The geometry of space-time in dual theory is studied through the coupling of the graviton, scalar and antisymmetric tensor states to the Ramond-Dirac system (fermionic string). The requirement of super-gauge algebra severely restricts the contents of the spin-connection coefficient and forbids the presence of torsion. The study of a model action in terms of local fields indicates that the dual theory in low energy limit is closely related to the Brans-Dicke theory with w=l. l. Introduction From the viewpoint of particle physics, the quantum theory of gravity is no more than the theory of graviton and its interaction with itself and other particles.