Abstract
We estimate thermal one-point functions in the 3d Ising CFT using the operator product expansion (OPE) and the Kubo-Martin-Schwinger (KMS) condition. Several operator dimensions and OPE coefficients of the theory are known from the numerical bootstrap for flat-space four-point functions. Taking this data as input, we use a thermal Lorentzian inversion formula to compute thermal one-point coefficients of the first few Regge trajectories in terms of a small number of unknown parameters. We approximately determine the unknown parameters by imposing the KMS condition on the two-point functions 〈σσ〉 and 〈ϵϵ〉. As a result, we estimate the one-point functions of the lowest-dimension ℤ2-even scalar ϵ and the stress energy tensor Tμν. Our result for 〈σσ〉 at finite-temperature agrees with Monte-Carlo simulations within a few percent, inside the radius of convergence of the OPE.
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Iliesiu, L., Koloğlu, M. & Simmons-Duffin, D. Bootstrapping the 3d Ising model at finite temperature. J. High Energ. Phys. 2019, 72 (2019). https://doi.org/10.1007/JHEP12(2019)072
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DOI: https://doi.org/10.1007/JHEP12(2019)072