Abstract

We apply the numerical bootstrap program to chiral operators in four-dimensional $$ \mathcal{N}=2 $$ SCFTs. In the first part of this work we study four-point functions in which all fields have the same conformal dimension. We give special emphasis to bootstrapping a specific theory: the simplest Argyres-Douglas fixed point with no flavor symmetry. In the second part we generalize our setup and consider correlators of fields with unequal dimension. This is an example of a mixed correlator and allows us to probe new regions in the parameter space of $$ \mathcal{N}=2 $$ SCFTs. In particular, our results put constraints on relations in the Coulomb branch chiral ring and on the curvature of the Zamolodchikov metric.

Highlights

  • Critical 3d Ising model, where the the low-lying spectrum was obtained in [2, 3] by studying the four-point function of the spin operator

  • We start with a brief introduction to chiral operators, and proceed to study the multiplets being exchanged in the OPE, as well as the superconformal blocks that capture the contributions of each superconformal family to the four-point function

  • In [11], the CFT data was constrained by obtaining an upper bound on the dimension of the first unprotected long scalar operator, and a lower bound on the central charge

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Summary

The chiral four point functions

We will set up the crossing symmetry equation for N = 2 chiral correlators of unequal dimension. This is an example of a mixed correlator, and will allow us to explore regions inaccessible with the single correlator bootstrap. The remarkable success of the mixed correlator bootstrap in three dimensions is one of the main motivations for considering mixed correlators in N = 2 SCFTs. We start with a brief introduction to chiral operators, and proceed to study the multiplets being exchanged in the OPE, as well as the superconformal blocks that capture the contributions of each superconformal family to the four-point function. The bootstrap for chiral correlators in three dimensions was studied in [18, 19]

Chiral fields
G H0 H1 H2 D4 E6 E7 E8 c
The OPE and superconformal blocks
Crossing equations
Numerical implementation
Results for the single correlator bootstrap
Bounds on C OPE coefficients
Dimension bounds for the chiral channel
The rank one H0 theory
Scalar bound for H0
OPE bounds for H0
Results for the mixed correlator bootstrap
Central charge bounds
More bounds on OPE coefficients
Dimension bounds for the non-chiral channel
Conclusions
B Superconformal blocks
C Crossing equations

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