The large central charge limit of conformal blocks

Vladimir Fateev (1) , Sylvain Ribault (1)

1 L2C - Laboratoire Charles Coulomb

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.

Domaines: Physique des Hautes Energies - Théorie [hep-th]

Vladimir Fateev, Sylvain Ribault. The large central charge limit of conformal blocks. Journal of High Energy Physics, 2012, pp.JHEP02(2012)001. ⟨10.1007/JHEP02(2012)001⟩. ⟨hal-00627906v3⟩