About: Type I string theory is a research topic. Over the lifetime, 2517 publications have been published within this topic receiving 152360 citations. The topic is also known as: Type I string.
TL;DR: In this article, it was shown that the large-N limits of certain conformal field theories in various dimensions include in their Hilbert space a sector describing supergravityon the product of anti-de Sitter spacetimes, spheres, and other compact manifolds.
Abstract: We show that the large-N limits of certainconformal field theories in various dimensions includein their Hilbert space a sector describing supergravityon the product of anti-de Sitter spacetimes, spheres, and other compact manifolds. This is shown bytaking some branes in the full M/string theory and thentaking a low-energy limit where the field theory on thebrane decouples from the bulk. We observe that, in this limit, we can still trust thenear-horizon geometry for large N. The enhancedsupersymmetries of the near-horizon geometry correspondto the extra supersymmetry generators present in thesuperconformal group (as opposed to just the super-Poincaregroup). The 't Hooft limit of 3 + 1 N = 4 super-Yang–Mills at the conformal pointis shown to contain strings: they are IIB strings. Weconjecture that compactifications of M/string theory on various anti-de Sitterspacetimes is dual to various conformal field theories.This leads to a new proposal for a definition ofM-theory which could be extended to include fivenoncompact dimensions.
TL;DR: In this article, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor, and this framework can be embedded in string theory.
TL;DR: In this article, the authors discuss the role of topological defects in the early universe and the evolution of string fields and their relationship with the structure formation of strings, including superconducting and global strings.
Abstract: Preface 1. Introduction 2. Phase transitions in the early universe 3. Topological defects 4. String field theory 5. Superconducting strings 6. String dynamics 7. String gravity 8. String interactions 9. String evolution 10. Cosmological implications of strings 11. Structure formation with strings 12. Cosmology of superconducting and global strings 13. Domain walls 14. Monopoles 15. Textures 16. Topological defects and inflation References Index.
TL;DR: The strong coupling dynamics of string theories in dimension d ⩾ 4 are studied in this paper, where it is argued that eleven-dimensional supergravity arises as a low energy limit of the ten-dimensional Type IIA superstring.
TL;DR: In this article, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor, and this framework can be embedded in string theory.
Abstract: Recently, a new framework for solving the hierarchy problem has been proposed which does not rely on low energy supersymmetry or technicolor. The gravitational and gauge interactions unite at the electroweak scale, and the observed weakness of gravity at long distances is due the existence of large new spatial dimensions. In this letter, we show that this framework can be embedded in string theory. These models have a perturbative description in the context of type I string theory. The gravitational sector consists of closed strings propagating in the higher-dimensional bulk, while ordinary matter consists of open strings living on D3-branes. This scenario raises the exciting possibility that the LHC and NLC will experimentally study both ordinary aspects of string physics such as the production of narrow Regge-excitations of all standard model particles, as well more exotic phenomena involving strong gravity such as the production of black holes. The new dimensions can be probed by events with large missing energy carried off by gravitons escaping into the bulk. We finally discuss some important issues of model building, such as proton stability, gauge coupling unification and supersymmetry breaking.