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The conformal bootstrap: Theory, numerical techniques, and applications

David Poland, Slava Rychkov, and Alessandro Vichi

David Poland

  • Department of Physics, Yale University, 217 Prospect St., New Haven, Connecticut 06511, USA

Slava Rychkov

  • Institut des Hautes Études Scientifiques, Bures-sur-Yvette, France and Laboratoire de physique théorique, Département de physique de l’ENS, École normale supérieure, PSL University, Sorbonne Universités, UPMC Univ. Paris 06, CNRS, 75005 Paris, France

Alessandro Vichi

  • Institute of Physics, École Polytechnique Fédérale de Lausanne, Switzerland

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Rev. Mod. Phys. 91, 015002 – Published 11 January, 2019

DOI: https://doi.org/10.1103/RevModPhys.91.015002

Abstract

Conformal field theories have been long known to describe the fascinating universal physics of scale invariant critical points. They describe continuous phase transitions in fluids, magnets, and numerous other materials, while at the same time sit at the heart of our modern understanding of quantum field theory. For decades it has been a dream to study these intricate strongly coupled theories nonperturbatively using symmetries and other consistency conditions. This idea, called the conformal bootstrap, saw some successes in two dimensions but it is only in the last ten years that it has been fully realized in three, four, and other dimensions of interest. This renaissance has been possible due to both significant analytical progress in understanding how to set up the bootstrap equations and the development of numerical techniques for finding or constraining their solutions. These developments have led to a number of groundbreaking results, including world-record determinations of critical exponents and correlation function coefficients in the Ising and O(N) models in three dimensions. This article will review these exciting developments for newcomers to the bootstrap, giving an introduction to conformal field theories and the theory of conformal blocks, describing numerical techniques for the bootstrap based on convex optimization, and summarizing in detail their applications to fixed points in three and four dimensions with no or minimal supersymmetry.

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Rev. Mod. Phys. 91, 015002– Published 11 January, 2019
  • Received 13 May 2018
Article part of CHORUS
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