The inflationary universe in the gauged N=8 supergravity induced from a superstring

N=8 supergravity can contain a large negative cosmological constant. If this supergravity was induced on a four-dimensional space-time submanifold of a ten-dimensional space by a superstring moving in the latter manifold then there exists the possibility of a mutual cancellation of the constant mentioned and a positive one arising on the given submanifold due to quantum effects from the superstring. After this the evolution of the submanifold will depend essentially on its topological properties. (orig.)