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What is string theory

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TLDR
The first part is an introduction to conformal field theory and string perturbation theory and the second part deals with the search for a deeper answer to the question posed in the title as discussed by the authors.
Abstract
The first part is an introduction to conformal field theory and string perturbation theory. The second part deals with the search for a deeper answer to the question posed in the title. Contents: 1. Conformal Field Theory 2. String Theory 3. Vacua and Dualities 4. String Field Theory or Not String Field Theory 5. Matrix Models

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Large N Field Theories, String Theory and Gravity

TL;DR: In this paper, the holographic correspondence between field theories and string/M theory is discussed, focusing on the relation between compactifications of string theory on anti-de Sitter spaces and conformal field theories.
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Cosmological constant—the weight of the vacuum

TL;DR: A review of cosmological constants can be found in this paper, where the authors discuss several aspects of the Cosmological Constant problem from both cosmology and theoretical perspectives.
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Low energy hadron physics in holographic QCD

TL;DR: In this paper, a holographic dual of four-dimensional, large N_c QCD with massless flavors was constructed by placing N_f probe D8-branes into a D4 background, where supersymmetry is completely broken.
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Topological insulators and superconductors: Tenfold way and dimensional hierarchy

TL;DR: In this paper, the authors constructed representatives of topological insulators and superconductors for all five classes and in arbitrary spatial dimension d, in terms of Dirac Hamiltonians.
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The dS/CFT correspondence

TL;DR: In this article, a holographic duality is proposed relating quantum gravity on dSD (D-dimensional de Sitter space) to conformal field theory on a single SD−1 ((D-1)-sphere), in which bulk de Sitters correlators with points on the boundary are related to CFT correlators on the sphere, and points on + (the future boundary of dSD) are mapped to the antipodal points on SD− 1 relative to those on − for the case of dS3, which is analyzed in some detail, the central charge of
References
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Book

Quantum Field Theory

TL;DR: In this article, a modern pedagogic introduction to the ideas and techniques of quantum field theory is presented, with a brief overview of particle physics and a survey of relativistic wave equations and Lagrangian methods.
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The world as a hologram

TL;DR: In this article, the effects of particle growth with momentum on information spreading near black hole horizons were investigated. But the authors only considered the earliest times of the propagation of information near the horizon.
Book

Quantization of Gauge Systems

TL;DR: In this paper, a systematic study of the classical and quantum theories of gauge systems is presented, starting with Dirac's analysis showing that gauge theories are constrained Hamiltonian systems, and the classical foundations of BRST theory are laid out with a review of the necessary concepts from homological algebra.
Journal ArticleDOI

Monopoles, duality and chiral symmetry breaking in N=2 supersymmetric QCD

TL;DR: In this article, the authors studied four dimensional N = 2 supersymmetric gauge theories with matter multiplets and derived the exact metric on the moduli space of quantum vacua and the exact spectrum of the stable massive states.
Journal Article

Phase transitions and critical phenomena

TL;DR: The examination of phase transitions and critical phenomena has dominated statistical physics for the latter half of this century as discussed by the authors, and beautiful experimental results have elucidated the singularities (critical behavior) that occur in phase transitions.
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