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2015

Reflections on Conformal Spectra

Kim, Hyungrok, Kravchuk, Petr, Ooguri, Hirosi

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We use modular invariance and crossing symmetry of conformal field theory to reveal approximate reflection symmetries in the spectral decompositions of the partition function in two dimensions in the limit of large central charge and of the four-point function in any dimension in the limit of large scaling dimensions $\Delta_0$ of external operators.

We use these symmetries to motivate universal upper bounds on the spectrum and the operator product expansion coefficients, which we then derive by independent techniques.
Some of the bounds for four-point functions are valid for finite $\Delta_0$ as well as for large $\Delta_0$.
We discuss a similar symmetry in a large spacetime dimension limit.

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