Dynamical symmetry breaking in nonperturbative string theory
We overview nonperturbative formulations of string theory
as quantum gravity. We first review virtues and faults of
perturbative and nonperturbative string theories. Emphasis is
put on roles played by st-duality/symmetries in perturbative/
nonperturbative string theory, respectively.
Instead of explaining details of our works on dynamical symmetry
breaking in nonperturbative string theory, we will discuss
their significance in attempts toward nonperturbative
formulation of string theory.