In this report we survey the low-energy phenomenological implications of superstring-
inspired E 6 models. The motivation for such models is reviewed. New particles including …

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We provide an overview of the string landscape and the Swampland program. Our review of
the string landscape covers the worldsheet and spacetime perspectives, including vacua …

We propose a new framework for solving the hierarchy problem which does not rely on
either supersymmetry or technicolor. In this framework, the gravitational and gauge …

Abstract Foreword; Preface; Notation; 10. Type I and type II superstrings; 11. The heterotic
string; 12. Superstring interactions; 13. D-branes; 14. Strings at strong coupling; 15 …

Differential geometry and topology have become essential tools for many theoretical
physicists. In particular, they are indispensable in theoretical studies of condensed matter …

String Theory comprises two volumes which give a comprehensive and pedagogic account
of the subject. Volume 1, first published in 1998, provides a thorough introduction to the …

A bstract In this paper we discuss gauging noninvertible zero-form symmetries in two
dimensions. We specialize to certain gaugeable cases, specifically, fusion categories of the …

String theory is one of the most exciting and challenging areas of modern theoretical
physics. This book guides the reader from the basics of string theory to recent developments …

We define chiral vertex operators and duality matrices and review the fundamental identities
they satisfy. In order to understand the meaning of these equations, and therefore of …