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Title: Causality constraints in conformal field theory

Journal Article · · Journal of High Energy Physics (Online)

Causality places nontrivial constraints on QFT in Lorentzian signature, for example fixing the signs of certain terms in the low energy Lagrangian. In d dimensional conformal field theory, we show how such constraints are encoded in crossing symmetry of Euclidean correlators, and derive analogous constraints directly from the conformal bootstrap (analytically). The bootstrap setup is a Lorentzian four-point function corresponding to propagation through a shockwave. Crossing symmetry fixes the signs of certain log terms that appear in the conformal block expansion, which constrains the interactions of low-lying operators. As an application, we use the bootstrap to rederive the well known sign constraint on the (Φ)4 coupling in effective field theory, from a dual CFT. We also find constraints on theories with higher spin conserved currents. As a result, our analysis is restricted to scalar correlators, but we argue that similar methods should also impose nontrivial constraints on the interactions of spinning operators

Research Organization:
Cornell Univ., Ithaca, NY (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
SC0014123
OSTI ID:
1326962
Journal Information:
Journal of High Energy Physics (Online), Vol. 2016, Issue 5; ISSN 1029-8479
Publisher:
Springer BerlinCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 159 works
Citation information provided by
Web of Science

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Cited By (35)

The analytic functional bootstrap. Part II. Natural bases for the crossing equation journal February 2019
Scalar-fermion analytic bootstrap in 4D journal June 2019
Unitarity and positivity constraints for CFT at large central charge journal July 2017
Spectral sum rules for conformal field theories in arbitrary dimensions journal July 2017
Lightcone effective Hamiltonians and RG flows journal August 2018
A conformal collider for holographic CFTs journal October 2018
Chaos bound in Bershadsky-Polyakov theory journal October 2019
An exactly solvable quench protocol for integrable spin models journal November 2017
Scattering effect on entanglement propagation in RCFTs journal December 2016
Entanglement and Rényi entropy of multiple intervals in T T ¯ -deformed CFT and holography journal November 2019
Classification of out-of-time-order correlators journal January 2019
Softness and Amplitudes' Positivity for Spinning Particles text January 2016
Modular Hamiltonians for Deformed Half-Spaces and the Averaged Null Energy Condition text January 2016
Scattering effect on entanglement propagation in RCFTs text January 2016
Einstein gravity 3-point functions from conformal field theory text January 2016
Spectral sum rules for conformal field theories in arbitrary dimensions text January 2016
Classification of out-of-time-order correlators text January 2017
Analyticity in Spin in Conformal Theories text January 2017
Holographic Reconstruction of AdS Exchanges from Crossing Symmetry text January 2017
Bulk Phase Shift, CFT Regge Limit and Einstein Gravity text January 2017
Conformal Bootstrap in the Regge Limit text January 2017
From Conformal Blocks to Path Integrals in the Vaidya Geometry text January 2017
Constraints on Higher Spin CFT$_2$ text January 2017
Massive Spin-2 Scattering and Asymptotic Superluminality text January 2017
Shockwaves from the Operator Product Expansion preprint January 2017
Scalar CFTs and Their Large N Limits text January 2017
Scalar-Fermion Analytic Bootstrap in 4D preprint January 2017
Double-Trace Deformations of Conformal Correlations text January 2018
Light-ray operators in conformal field theory text January 2018
The Conformal Bootstrap: Theory, Numerical Techniques, and Applications text January 2018
A Conformal Collider for Holographic CFTs text January 2018
Anomalous Dimensions from Crossing Kernels text January 2018
Bootstrap and collider physics of parity violating conformal field theories in $d=3$ preprint January 2018
Chaos bound in Bershadsky-Polyakov theory text January 2019
Dynamical Constraints on RG Flows and Cosmology text January 2019

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