Gauge-gravity correspondence and the construction of non-perturbative string theory

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The purpose of the present research project is to pursue the possibility of constructing a unified theory of all fundamental interactions including gravity, on the basis of the so-called (super) string theory. In particular, we have investigated the correspondence between (super) gravity theory (or general relativity theory) and quantum gauge theories, the latter of which constitute standard theories for describing electro-weak and nuclear (or strong) interactions. We have uncovered several new facets of this remarkable correspondence and also of non-perturbative properties of string theory by developing new theoretical methods and tools in studying this difficult question. We hope that our new findings provide important clues toward the final goal of unifying quantum theory and general relativity, which continues to be a dream of modern physicists.