M-Theory and Duality

Abstract

Up to now, none of the methods discussed in this book have provided us with deep insights into nonperturbative string theory and its true vacuum. There are still gaps in our understanding of the string perturbation theory because of the problems associated with supermoduli. Furthermore, string perturbation theory cannot yield the true vacuum of string theory. Conformal field theories, although they give us a powerful tool to classify millions of possible vacua for string theory, are still defined perturbatively and are unable to probe the nonperturbative region. String field theory, although it is defined independently of perturbation theory, is currently too difficult to solve for the nonperturbative region.KeywordsString TheoryModulus SpaceHeterotic StringClosed StringConformal Field TheoryThese keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.