RECENT DEVELOPMENTS IN D=2 STRING FIELD THEORY

Recent Developments in String Theory

After briefly reviewing basic concepts of perturbative string theory, we explain in simple terms some of the new findings that created excitement among the string physicists. These developments include non-perturbative dualities and a unified picture that embraces the so-far known theories. Contribution to the Proceedings of the XVIII International Symposium on Lepton Photon Interactions XVIII ...

Recent developments in effective field theory

We will give a short introduction to the one-nucleon sector of chiral perturbation theory and will address the issue of a consistent power counting and renormalization. We will discuss the infrared regularization and the extended on-mass-shell scheme. Both allow for the inclusion of further degrees of freedom beyond pions and nucleons and the application to higher-loop calculations. As applicat...

DEVELOPMENT IN STRING THEORY

The string theory is a fast moving subject, both physics wise and in the respect of mathematics. In order to keep up with the discipline it is important to move with new ideas which are being stressed. Here I wish to give extracts from new papers of ideas which I have recently found interesting. There are six papers which are involved: I ."Strings formulated directly in 4 dimensions " A. N...

Recent developments in affine Toda quantum field theory

Recent Developments in Non-perturbative Quantum Field Theory

In the last couple of years we have been witnessing a series of impressive results in the framework of two different but related types of quantum theories: supersymmetric Yang–Mills theories in four dimensions and superstrings. They have in common space-time supersymmetry. They also share the property that a formal perturbative expansion can be defined for these theories, and “renormalization” ...