TH Journal Club on String Theory
Mellin bootstrap for global symmetry
4-2-011 - TH common room (CERN)
4-2-011 - TH common room
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We use the ideas of conformal bootstrap in Mellin space to get analytic results for dimensions and OPE coefficients of various operators in conformal field theories with O(N) symmetry and cubic anisotropy. We write down the conditions arising from the consistency between the operator product expansion and crossing symmetry in Mellin space and solve the constraint equations to compute the anomalous dimension and the OPE coefficients of all operators quadratic in the fields in the epsilon expansion for the Wilson-Fisher fixed point. This allows us to reproduce the known results and derive new results up to O(\epsilon^3). Most of the results for the cubic anisotropy case we quote appear to be unexplored. For the O(N) case we also study the large N limit in general dimensions and reproduce the known results at the leading order in 1/N. Results that are otherwise very difficult to find from Feynman diagrams and impossible with the conventional bootstrap, are obtained very simply with this approach.