Solving the 3D Ising model with the conformal bootstrap

Abstract : We study the constraints of crossing symmetry and unitarity in general 3D conformal field theories. In doing so we derive new results for conformal blocks appearing in four-point functions of scalars and present an efficient method for their computation in arbitrary space-time dimension. Comparing the resulting bounds on operator dimensions and product-expansion coefficients in 3D to known results, we find that the 3D Ising model lies at a corner point on the boundary of the allowed parameter space. We also derive general upper bounds on the dimensions of higher spin operators, relevant in the context of theories with weakly broken higher spin symmetries.
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Sheer El-Showk, Miguel Paulos, David Poland, Slava Rychkov, David Simmons-Duffin, et al.. Solving the 3D Ising model with the conformal bootstrap. Physical Review D, American Physical Society, 2012, 86 (2), pp.25022. ⟨10.1103/PhysRevD.86.025022⟩. ⟨cea-00825766⟩

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