The large central charge limit of conformal blocks

Abstract

We study conformal blocks of conformal field theories with a W3 symmetry algebra in the limit where the central charge is large. In this limit, we compute the four-point block as a special case of an sl3-invariant function. In the case when two of the four fields are semi-degenerate, we check that our results agree with the block's combinatorial expansion as a sum over Young diagrams. We also show that such a block obeys a sixth-order differential equation, and that it has an unexpected singularity at z=-1, in addition to the expected singularities at z=0,1,infinity.

22 pages, v3: added clarifications and references in Section 2, other minor improvements, published in JHEP

References in corpus (5)

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• Correlation functions in conformal Toda field theory I
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• Integrable structure, W-symmetry and AGT relation
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