A UNIVERSAL w STRING THEORY

W-infinity and String Theory

We review some recent developments in the theory of W∞. We comment on its relevance to lower-dimensional string theory. CERN-TH.6404/92 February 1992

Punctures in W-string theory

Using the differential equation approach to W-algebras, we discuss the inclusion of punctures in W-string theory. The key result is the existence of different kinds of punctures in W-strings. We obtain the moduli associated with these punctures and present evidence in existing W-string theories for these punctures. The W3 case is worked out in detail. It is conjectured that the (1, 3) minimal m...

A Universal Orchestra: String and M-Theory

String theory as a universal language

This article, based on the Klein lecture, contains some new results and new speculations on various topics. They include discussion of open strings in the AdS space, unusual features of D-branes, conformal gauge theories in higher dimensions. We also comment on the infrared screening of the cosmological constant and on the ”brane worlds”

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...