Fractional conformal descendants and correlators in general 2D \(S_N\) orbifold CFTs at large \(N\). (English) Zbl 1541.81154
Summary: We consider correlation functions in symmetric product (\(S_N\)) orbifold CFTs at large \(N\) with arbitrary seed CFT. Specifically, we consider correlators of descendant operators constructed using both the full Virasoro generators \(L_m\) and fractional Virasoro generators \(\ell_{m/n_i}\). Using covering space techniques, we show that correlators of descendants may be written entirely in terms of correlators of ancestors, and further that the appropriate set of ancestors are those operators that lift to conformal primaries on the cover. We argue that the covering space data should cancel out in such calculations. To back this claim, we provide some example calculations by considering a three-point function of the form (4-cycle)-(2-cycle)-(5-cycle) that lifts to a three-point function of arbitrary primaries on the cover, and descendants thereof. In these examples we show that while the covering space is used for the calculation, the final descent relations do not depend on covering space data, nor on the details of which seed CFT is used to construct the orbifold, making these results universal.
MSC:
| 81T40 | Two-dimensional field theories, conformal field theories, etc. in quantum mechanics |
| 81T30 | String and superstring theories; other extended objects (e.g., branes) in quantum field theory |
| 81R10 | Infinite-dimensional groups and algebras motivated by physics, including Virasoro, Kac-Moody, \(W\)-algebras and other current algebras and their representations |
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